In the case of CH3Cl, there are only two single atoms C and Cl, where their electronegativity values are 2.6 and 3.2. Step 1: Find the central atom: Usually, single-atom with the least electronegativity becomes the central atom. Now, let us study the step-by-step method for drawing the Lewis structure of Chloromethane (CH3Cl).
So, the number of valence electrons in the outermost shell for Chlorine (Cl) is 7. Lastly for Chlorine (Cl), the atomic number is 17 where its electronic configuration is 1s2 2s2 2p6 3s2 3p5. This makes the number of valence electrons in one Carbon (C) 4. In the case of Carbon (C), its atomic number is 6, so the electronic configuration is 1s2 2s2 2p2. As the s shell needs two electrons, there is a vacancy of one electron, so the number of valence electrons in one Hydrogen (H) atom is 1. The atomic number of Hydrogen (H) is 1, so its electronic configuration is 1s1. To begin with the Lewis structure of CH3Cl, first, we need to determine the electronic configuration of each participating atom. In addition to this, the Lewis structure also determines whether a single, double or triple bond is formed between the interacting atoms. If you realize, these valence electrons are always written in pair at each side of the symbol to show if all paired electrons exist or not. Within the diagram, the ‘dots’ nearby the symbol of an element represents the valence electrons. The diagram is drawn to determine how the valence electrons of different atoms participate in the bond formation to form a molecule. The Lewis structure is a pictorial representation showing the electrons present in the valence shell in an atom. Conclusion Lewis Structure of Chloromethane (CH3Cl)
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