Rules of Lewis Structures

• No. of valence electrons of an atom = Group number

• Except for H

(and atoms of 3rd and higher periods),

#Bond Pairs + #Lone Pairs = 4

• For Groups 5A-7A (N - F),

no. of BOND PAIRS = 8 - group No.

• For Groups 1A-4A (Li - C),

no. of BOND PAIRS = group number

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