The electronegative value difference between carbon and chlorine, Electronegativity value of chlorine= 3.16, Difference of electronegativity value between carbon and chlorine= 3.16 2.55 =0.61, The electronegative value difference between carbon and hydrogen, Electronegativity value of hydrogen= 2.20, Difference of electronegativity value between carbon and hydrogen= 2.55 2.20 =0.35. A step-by-step explanation of how to draw the CH2Cl2 Lewis Dot Structure (Dichloromethane).For the CH2Cl2 structure use the periodic table to find the total . The arrangement of the molecules in this compound is such that the Carbon atom is in the central atom, one Hydrogen atom is on the upper topmost position and the other one is on the left side of the central atom. The total valence electron available for drawing the, The steric number of the carbon central atom in the CH. the fewest number of formal charges possible, i.e. Just another site The carbon atom has an electronegativity of 2.55, while chlorine has an electronegativity of 3.16 in the CH2Cl2 molecule. Your email address will not be published. The carbon atom completes its molecular stability in the CH2Cl2 molecule because it possesses 8 electrons in its bond pairs with two chlorine and two hydrogens in the outermost valence shell. Note that there are 8 atomic orbitals mixing to form 8 molecular orbitals. Dichloromethane or methylene chloride, with the chemical formula CH2Cl2, is a colorless, volatile liquid with a boiling point of 39.6 C. Examples: CH 4, NH 3, I 2. Are these molecules polar or nonpolar? SMOJ. Step 2. In this case the N is short 2 electrons so we can use a lone pair from the left most O atom to form a double bond and complete the octet on the N atom. The Carbon atom (C) is at the center and it is surrounded by two Hydrogen (H) and two Chlorine atoms (Cl). What is the Lewis structure of CH2Cl2? Carbon already shares 8 electrons to the four single C-Cl and C-H bonds. Then the total outermost valence shell electrons can be calculated as follows, Total outermost valence shell electrons available for CH2Cl2 Lewis structure( dot structure) = 4 +2*7+ 2*1=20 valence electrons in CH2Cl2. The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. But before looking at that, let us first discuss the valence electrons present in this compound as these electrons are the ones that form bonds. The theory states that this happens to avoid repulsive forces. In this article, we will know the structure, molecular geometry, applications and other chemical properties in detail. Now count the valence electron used in the above structure. Because it has a total of eight electrons in the outermost valence shell. Since Hydrogen is less electronegative than cl there That means, we have obtained the best structure for dichloromethane lewis structure. Carbon and Chlorine form a single bond as they share one electron to complete each others octet. 4. - Science Education and Tutorials, Pingback: NH3 Molecular Geometry - Science Education and Tutorials, Your email address will not be published. #1 Draw Sketch. Lone pairs are those represented as dots in the lewis diagram that do not take part in the formation of bonds and are also called nonbonding electrons. So, for the steric number of 4, we get thehybridization of CH2Cl2 is Sp3. Hence there is no change in the above sketch of CH2Cl2. Calculate the total number of valence electrons in the CH2Cl2 molecules outermost valence shell. So for each chlorine, there are three lone pairs, and for carbon, there is zero lone pair because all six electron pairs are over. There are twenty valence electrons in the compound, and four bonds are formed. Calculation of valence electrons in CH2Cl2. As a result, central carbon in the CH2Cl2 Lewis structure, with all two chlorine and two hydrogens arranged in the tetrahedral geometry. In CH2Cl2, carbon satisfies this condition (4 electrons short of the octet versus 1 for chlorine). The CH2Cl2 molecules total dipole moment is predicted to be 1.6 D. It has a partial negative charge for chlorine atoms and a partial positive charge for the central carbon atom. Step 2: For output, press the "Submit or Solve" button. The molecular geometry or shape of CH2Cl2 is Tetrahedral, since, there are 4 regions of electron density around the central atom, and all the regions are bonding regions. Similarly, each Hydrogen atom needs one electron, which they share with the central Carbon atom, and hence their outer shell is also completed. Explore molecule shapes by building molecules in 3D! It is miscible with many organic solvents. The net dipole moment of the CH2Cl2 molecule is 1.6 D. The central atom is carbon, which is bordered on four terminals with two chlorine atoms, two hydrogen atoms, and no lone pair on the carbon in the tetrahedral geometry. Place C in the center and attach 2 Cl atoms to it, and attach 2 Carbon has four outermost valence electrons, indicating that it possesses four electrons in its outermost shell, whereas chlorine only has seven valence electrons in its outermost shell. The molecule is neutral, i.e., there is no charge on it. See Answer. The CH2Cl2 Lewis structure is a diagram that illustrates the number of valence electrons and bond electron pairs in the CH2Cl2 molecule. Check the stability with the help of a formal charge concept. A is the number of atoms/groups attached to the central atom; VE is the number of valence electrons on the central atom; Herein, A = 4, VE = 4, V = 4, C = 0; therefore, Hyb = 4, corresponding to sp3. 4. Methylene chloride, also known as Dichloromethane (DCM), is an organic chemical compound. These overlapped orbitals are called hybrid orbitals. Lewis Structure of F2 (With 6 Simple Steps to Draw! In the periodic table, carbon lies in group 14, hydrogen lies in group 1, and chlorine lies in group 17. Q: Draw the Lewis structure of CHNH and then choose the appropriate pair of hybridization states for. There are eight electrons being shared in the Lewis structure of Start your trial now! A passion for sharing knowledge and a love for chemistry and science drives the team behind the website. Then place no electrons as a lone pair of electrons on the carbon atom of the CH2Cl2 molecule. Step-2: Lewis Structure of CH2Cl2 for constructing around the more electronegative atom. There are four oxygen atoms in SO 42- ion, Therefore. In this step, we will put the remaining valence electron on the outer atom first for completing their octet. A chlorine atom needs 8 electrons to complete the outer shell. Two electrons are shared between the C atom and each H and Cl. When two or molecules participate in the bond formation, their orbitals overlap due to the sharing of electrons. Transcript: This is the Lewis structure for CH2Cl2. and a melting point of -96.7 C. Hence all the valence electrons are used up, and there are four single bonds in the Lewis structure of CH, One can find the hybridization of any given, Cl as there is symmetric distribution of electrons), The carbon atom has an electronic configuration of 1s, in its ground state and has when it is in an excited state; the configuration is 1s. When we draw a lewis structure, there are several guidelines to follow. Answer (1 of 4): Actually, no, there is only one acceptable Lewis structure for CH_2Cl_2 Moving the chlorines around does not produce a new compound with a new structure. { Charges of -1 and +1 on adjacent atoms can usually be removed by using a lone pair of electrons from the -1 atom to form a double (or triple) bond to the atom with the +1 charge. So, we are left with 12 valence electrons. CH2Cl2. The shape of the compound is a trigonal pyramidal. So let us have a look at the total number of valence electrons for CH, Now that we know the total number of valence electrons in CH. As the hybridization is sp3, the molecular geometry of Dichloromethane becomes tetrahedral. As there are three hydrogen atoms, we will first put these atoms around the Carbon atom. It is widely used as a solvent in chemistry laboratories. By looking at the CH2Cl2 lewis structure, we see there are 4 single bonds means 4 bonding pairs, and there are 12 dots electrons around two chlorine atoms means 6 lone pairs. Hydrogen has 1 electron in its 1s orbital and a s . Yes CH2Cl2 is polar because its molecular structure is not "@type": "Answer", So the above lewis dot structure of CH2Cl2 can also be represented as shown below. 3. This usually means the atom lower and/or to the right in the Periodic Table, N in this case.
Chemistry. As a result, wrap around the central carbon atoms bond pair valence electrons first (see figure for step1). Place remaining electrons on outer atoms and complete their octet. Step 3: That's it Now your window will display the Final Output of your Input. Hence. Draw the lewis dot structure for CH2Cl2. Now, there are no more lone pairs to mark on carbon atom. When we talk about CH2Cl2, Carbon is less electronegative than Chlorine atoms. It is an odorless and transparent gas that was initially used as a refrigerant. Now, we shall construct a skeleton of the molecule with carbon as the central atom. So place the Carbon atom in the center and draw four dots around it like this: Now that we have placed the Carbon atom, lets put other atoms. Explanation: C2Cl2 has linear structure.. For its Lewis structure, the C2Cl2 molecule has a total of 22 valence electrons. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Chlorine is the most electronegative atom. Find the least electronegative atom and place it at center. Remember that, there are total of ten electron pairs. View all posts by Priyanka , Your email address will not be published. CH2Cl2 is also called Dichloromethane.----- Steps to Write Lewis Structure for compounds like CH2Cl2 -----1. Count how many outermost valence shell electrons have been used so far using the CH2Cl2 Lewis structure. Prolonged exposure to DCM can cause dizziness, fatigue, headache and much more as a result of acute absorption of the gas. Save my name, email, and website in this browser for the next time I comment. Thiosulfate ion contains two sulfur atoms and three oxygen atoms. The electron geometry of SCl2 is Tetrahedral. You can find the polarity of a compound by finding electronegativities (an atom's desire for an electron) of the atoms; Carbon has an electronegativity of 2.5, compared to Fluorine's. "text": " Valence electron in hydrogen atom = 1 This molecule is polar, with the negative end of the dipole near the two chlorines.c. A: Lewis dot structure or electron dot structure is used to represent the valance electrons in an atom. Stannous chloride, SnCl 2 is a white crystalline compound with molar mass 189.6 g/mol. He has a good conceptual knowledge on different educational topics and he provides the same on this website. You also have to see whether the chlorine atoms are forming an octet or not! This happens because it tries to achieve the same valence electron configuration as inert gases. The extent of mixing and thus the contribution of individual atomic orbitals to form a particular molecular orbital depends on the relative energy alignment of the atomic orbitals. Is it polar or nonpolar? Given this formal description, what is the geometry of the . It is an odorless and transparent gas that was initially used as a refrigerant. Another way of determining the hybridization of the central atom is by using the following formula. Then, all remaining six electron pairs are marked. . The structure of stannous chloride is angular or v-shaped with two bond pair and one lone pair. Therefore, chlorine atom will take three lone pair. The molecular geometry of any given molecule is based on the number of atoms involved and the bonds formed in the structure. Cl: Carbon, Hydrogen, and Chlorine. Put the least electronegative atom in the center. Lets draw and understand this lewis dot structure step by step. It has also been linked to various types of cancer and thus is a carcinogenic compound. If central atom does not have an octet, move electrons from outer atoms to form double or triple bonds.----- Lewis Resources ----- Lewis Structures Made Simple: https://youtu.be/1ZlnzyHahvo More practice: https://youtu.be/DQclmBeIKTc Counting Valence Electrons: https://youtu.be/VBp7mKdcrDk Calculating Formal Charge: https://youtu.be/vOFAPlq4y_k Exceptions to the Octet Rule: https://youtu.be/Dkj-SMBLQzMLewis Structures, also called Electron Dot Structures, are important to learn because they help us understand how atoms and electrons are arranged in a molecule, such as Dichloromethane. As per this theory, the electrons in a molecule are not individually assigned to atomic orbitals but to molecular orbitals. Electron filling starts from the least energetic molecular orbital. How many bonding pairs and lone pairs are present in the lewis structure of CH, What is the molecular geometry or shape of CH, How many valence electrons are present in the CH, Is CH2Cl2 Polar or Nonpolar? Hydrogen atoms always go on the outside of a Lewis Structure. Question: Choose the best Lewis structure for CH2Cl2. Required fields are marked *. In general you want: Why are there different ways for the "same" Lewis structure? Please note that several atoms follow the octet rule, i.e., they tend to achieve eight electrons in their valence shell through chemical bonding; this is reflected in the Lewis structure of the molecule. The asymmetric shape and electronegativity difference between atoms is an important aspect in determining whether a molecule is polar or not. Here the electrons shared by the Carbon lead to the formation of four hybridized orbitals, which include one s-orbital and three p-orbitals. Save my name, email, and website in this browser for the next time I comment. The molecule of dichloromethane (with tetrahedral molecular geometry) is tilted, the bond angles between chlorine, carbon, and hydrogen are 109.5 degrees. (1 0 2/2) = 0 formal charge on hydrogen atoms. Published By Vishal Goyal | Last updated: December 29, 2022, Home > Chemistry > CH2Cl2lewis structure and its molecular geometry. This means that the bond angles and bond lengths in CH2Cl2 are not identical; however, all bond angles are identical in CH4. the valence electrons C has four e-, H has 1 e-x2 so 2e-, and Cl lewis structure of CH2Cl2, carbon atom is located as the center atom and other atoms have made bonds One can find the hybridization of any given molecule by using this simple formula: Hybridization = No. Electrons are shown as "dots" or for bonding electrons as a line between the two atoms. } Hydrogen atoms only need two valence electrons to fulfill the outer shell. Having an MSc degree helps me explain these concepts better. To know the lewis structure, it is vital to find the number of valence electrons in the compound. Let's focus on the following topics on SnCl2. The approx bond angle in CH 2 Cl 2 is based on the type of bond, Cl-C-H = 108, H-C-H = 112, Cl-C-Cl = 112.2. eg=linear, mg=linear. Home How to draw CH2Cl2 Lewis Structure? only has one electron in its last shell (valence shell).Carbon that will use up The carbon (C) atom is kept at the central position and other atoms are at the surrounding position. Although it is no longer used as a refrigerant, Chloromethane has many uses and applications in several chemical and pharmaceutical industries. (because chlorine requires 8 electrons to have a complete outer shell). There are no charges on atoms in above structure. 1 Answer. Your email address will not be published. My aim is to uncover unknown scientific facts and sharing my findings with everyone who has an interest in Science. The following table lists this informationon the basis of VSEPR theory for various molecular stoichiometries. i wish i knew how to draw it but hopefully this The filled molecular orbitals are called bonding orbitals; the unfilled ones are anti-bonding orbitals. The structures drawn using this theory are termed Lewis (dot) structures. It should be noted that, In CH2Cl2, the carbon (C) atom has attached to four bonded atoms(2 hydrogen and 2 chlorine atoms), and it contains no lone pair which means, there are four regions of electron density around the carbon central atom. (ignore the ">" without them the formatting is off because A Lewis Structure is a very simplified representation of the valence shell electrons in a molecule. To read, write and know something new every day is the only way I see my day! For this compound, there is one molecule of Carbon, two molecules of Hydrogen and two molecules of Chlorine. It is represented by dots in the CH2Cl2 Lewis diagram. The carbon core atom (four single bonds connected to two chlorine and two hydrogen atoms ) of the CH2Cl2 molecule has four valence electrons, no lone pair of electrons, and eight bonding electrons. I write all the blogs after thorough research, analysis and review of the topics. It is widely used as a solvent in chemistry laboratories. First determine the total number of valence electrons in the molecule. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. There are some exceptions to this octet rule, e.g., Hydrogen. is a group IA element in the periodic table and A) B) :Cl-C-Cl: 9 C) D) E) Show transcribed image text. Electronegative Difference Calculation of CH2Cl2 Molecule: To sketch the CH2Cl2 Lewis structure by following these instructions: Step-1: CH2Cl2 Lewis dot Structure by counting valence electron, Step-2: Lewis Structure of CH2Cl2 for constructing around the more electronegative atom, Step-3: Lewis dot Structure for CH2Cl2 generated from step-1 and step-2. Having an MSc degree helps me explain these concepts better. Then place 3 lone pairs of electrons around each Cl Hence, there will not be any change in the above structure and the above lewis structure of CH2Cl2 is the final stable structure only. Well choose the least electronegative value atom in the CH2Cl2 molecule to place in the center of the CH2Cl2 Lewis structure diagram in this phase. He holds a degree in B.Tech (Chemical Engineering) and has four years of experience as a chemistry tutor. Lone Molecular Electron ridi Bond Pairs AX AXE AX Ch 4 The shape of molecules Soka Thus far, we have used two-dimensional Lewis structures to represent molecules. No lone pair of electrons on the carbon atom in the tetrahedral geometry of the CH2Cl2 molecule. In this stage, use four single bonds to connect all two chlorine and two hydrogen atoms on the outside of the CH2Cl2 molecule to the central carbon atom in the middle. This can help us determine the molecular geometry, how the molecule might react with other molecules, and some of the physical properties of the molecule (like boiling point and surface tension).Chemistry help at https://www.Breslyn.org The polarity of any compound depends on the lone pairs of electrons and symmetry of the compound. Worth 0 participation points and 3 correctness points You are given the following 5 number summary for a sample 2,13,22,31, 50 What is the LEAST appropriate statement that can be made? CH2Cl2 is considered toxic; its overexposure via inhalation leads to dizziness, nausea, numbness, and weakness. [ 2 dot electrons means one lone pair). Step 1. but not soluble in water. Lewis structure of CH2Cl2 contains a single bond between the Carbon (C) & Hydrogen (H) atoms as well as between the Carbon (C) & Chlorine (Cl) atoms. It is a colorless and volatile liquid with a sweet smell. How to calculate the formal charge on a carbon atom in CH2Cl2 Lewis Structure? Electrons are represented as dots, and each pair of bonding electrons between two atoms is shown as a line. Total valence electrons given by oxygen atoms = 6 *4 = 24. Well, clearly, there are 4 covalent bonds, and thus the number of shared electrons is 8. In order to draw the lewis structure of CH2Cl2, first of all you have to find the total number of valence electrons present in the CH2Cl2 molecule. Dr. Richard Spinney (The Ohio State University). Chloromethane ( CH3Cl) has 14 valence electrons. CH2Cl2 Lewis structure is dot representation, Zero charge on the CH2Cl2 molecular structure, Polarity of the molecules are listed as follows, Lewis structure and molecular geometry of molecules are listed below, Pingback: How to draw BeCl2 Lewis Structure? In the lewis structure of CH 2 Cl 2, there are four single bonds around the carbon atom, with two hydrogen atoms and two chlorine atoms attached to it, and on each chlorine atom, there are three lone pairs. yeah im not sure how to draw it out but ill explain it, first The carbon atom is the middle element in CH2Cl2 molecular geometry, with four electrons in its outermost valence electron shell, whereas the chlorine atom has seven electrons in its outermost valence electron shell. The number of valence electrons is therefore 7, and hence Cl needs 1 more to achieve the octet. CH2Cl2, total pairs of electrons are ten in their valence shells. The Lewis structure of the methane (CH4) molecule is drawn with four single shared covalent bonds between the carbon and hydrogen atoms each. VSEPR theory or Valence electron shall pair repulsion theory is the concept we use to determine the molecules shape. In this CH 2 Cl 2 molecule carbon is central atom ( it has the highest bonding capacity and it is the shortest of the octet). Put these values for the carbon atom in the formula above. It is used in the manufacturing of electronics. 1 triple bond and 2 single bonds. formal charges of 0 for as many of the atoms in a structure as possible. According to the octet rule, a molecule should have eight electrons in its outer shell to become inert or stable. All the four electrons are arranged in these hybridized orbitals, making the hybridization of this molecule sp3. Hydrogen peroxide is polar in nature and has a non-planar structure. Carbon requires 8 electrons in its outermost valence shell to complete the molecular stability, 8 electrons bond pairs in C-H and C-Cl bonds. The atomic number of calcium is 20, and the atomic number of argon (a noble gas) is 18, so calcium is on the second column of the periodic table. (adsbygoogle = window.adsbygoogle || []).push({});
. The lesser the formal charge on atoms, the better the stability of the lewis diagram. Draw the Lewis structure for CH3Cl and CO2; carbon is the central atom in both molecules. Carbon is less electronegative than Chlorine, so it'll go on the inside, and Hydrogens always go on the outside. Cl. 1. Techiescientist is a Science Blog for students, parents, and teachers. Because three are no charges on atoms in above CH2Cl2 structure, we do not need to do the step of reducing charges on atoms (Valence electrons are the number of electrons present in the outermost shell of an atom). the octet rule and formal charges need to be satisfied. Now in the above sketch of CH2Cl2 molecule, put the two electrons (i.e electron pair) between the carbon-hydrogen atoms and carbon-chlorine atoms to represent a chemical bond between them. To calculate the valence electron of each atom in CH2Cl2, look for its periodic group from the periodic table. What is the shape of each molecule? So far, weve used 20 of the CH2Cl2 Lewis structures total 20 outermost valence shell electrons. To read, write and know something new every day is the only way I see my day! Bonding pairs are the pair of electrons that are in a bond. arrow_forward In the Hence, the carbon atom is the least electronegative atom in the CH2Cl2 compound, therefore, we will put the carbon atom in a central position and (the chlorine and hydrogen atoms) in the surrounding position in the lewis diagram. The bond present in this molecule, C-Cl are polar since there is a large electronegativity difference between them. The formula for the formal charge is as follows. Correct Lewis Structure for CH2Cl2. An electron from the 22 orbital and three other electrons from 2p orbitals participate in forming bonds. the formal charges should match the electronegativity of the atom, that is negative charges should be on the more electronegative atoms and positive charges on the least electronegative atoms if possible. Dichloromethane (CH ii Cl 2) Lewis Structure. DCM is used as a solvent in the food industry and as a paint remover. "text": "Bonding pairs are the pair of electrons that are in a bond. Now, if you see closely, the Carbon atom is sharing four electrons with three hydrogen atoms and a Chlorine atom. The atoms that have complete octets or rather suffice the octet rule become inert and non-reactive. If youre interested in learning more about the chlorine octet rule, please see in our previous post. Valence electron in carbon atom = 4 Here hydrogen can not be the central atom. Step #1: Calculate the total number of valence electrons. and a melting point of -96.7 C. It is also metabolized in the body to form carbon monoxide and can cause poisoning. Gilbert Lewis's idea explained the covalent bond and set the foundation for valence bond theory. There are 2 electrons in its K shell and 4 electrons in the L shell. Both chlorine atom has three lone pairs and carbon atom does not has lone pairs. Chlorine is the second member of the halogen family. Corresponding to sp3 hybridization, the geometry is tetrahedral when there are no lone pairs of electrons on the central atom. Because no lone pair of a central carbon atom create interaction with C-Cl bond pairs. But no need to mark on hydrogen, because each hydrogen has already two electrons. ), Lewis Structure of ClO2- (With 6 Simple Steps to Draw! These four orbitals hybridize together to form four identical sp3 orbitals, all of which have the same energy. lewis structure for ch2cl. Use the formula given below-, Formal charge = (valence electrons Nonbonding electrons 1/2 bonding electrons). CH2Cl2 is a moderately polar molecule. In the Lewis structure of CH2Cl2, the formal charge on the central carbon atom is zero. CH2Cl2 is the chemical formula for DCM. https://geometryofmolecules.com/ch2cl2-lewis-structure-molecular-geometry-polarity/, https://techiescientist.com/ch2cl2-lewis-structure/, https://www.thegeoexchange.org/chemistry/bonding/Lewis-Structures/CH2Cl2-lewis-structure.html, https://www.chemistryscl.com/general/CH2Cl2-dichloromethane-lewis-structure/, https://lambdageeks.com/ch2cl2-lewis-structure/, https://topblogtenz.com/ch2cl2-lewis-dot-structure-molecular-geometry-hybridization-bond-angle/, https://sciedutut.com/ch2cl2-lewis-structure/, First, determine the total number of valence electrons. polarised toward the more electronegative chlorine, The CH2Cl2 molecule is classified as a polar molecule, chlorine octet rule, please see in our previous post, The polarity of CH2Cl2 is discussed in our previous post, How to draw BeCl2 Lewis Structure? Well, that rhymed. The bond angles of Carbon with Hydrogen and Chlorine atoms are 109.5 degrees. Valence electrons given by Carbon (C) atom = 4Valence electron given by each Hydrogen (H) atom = 1Valence electrons given by each Chlorine (Cl) atom = 7So, total number of Valence electrons in CH2Cl2 molecule = 4 + 1(2) + 7(2) = 20. (adsbygoogle = window.adsbygoogle || []).push({}); Copyright 2023 Science Education and Tutorials | authored by SciEduTut. Now we will find the least electronegative atom in the CH2Cl2 compound, after that, we will place it at the center of the lewis diagram and the rest atoms will be spread around it. In contrast, the Chlorine atom also completes its octet as it shares an electron with the Carbon atom. K shell has 2 electrons, L shell has 8, and M shell has 7 electrons. Cl, we can now draw a Lewis structure for the same. The outermost valence electrons of the CH2Cl2 molecule must be understood while considering the Lewis structure of the molecule. This structure helps understand the arrangement of valence electrons around the individual atoms along with the bonds they form. These electrons include the ones that participate in bond formation as well as the ones that dont participate in forming bonds. Cl. Total valence electrons given by sulfur atom = 6. The core atom in the CH2Cl2 Lewis structure is carbon, which is bonded to the chlorine and hydrogen atoms by four single bonds (C-Cl and C-H). Need to remember that, if you follow above said method, you can construct molecular dot structure very easily.
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