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There are 20 valence electrons in CH2Cl2.
C => 4 e-* x 1 (number of C in chemical formula) = 04 v.e-**
H => 1 e- x 2 = 02 v.e-
Cl => 7 e- x 2 = 14 v.e-
CH2Cl2 = 20 v.e-
*e- - this means electrons in short form
**v.e- - this means valence electrons in short form
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