For $\mathrm{CH}_{3} \mathrm{Cl}$, Carbon has 4 valence electrons, Hydrogen has 1 each (total 3 for 3 Hydrogens) and Chlorine has 7. So, total valence electrons are 14. For $\mathrm{SiO}_{4}^{4-}$, Silicon has 4 valence electrons, Oxygen has 6 each (total 24 for 4
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