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Valence electrons of main group metals
If table has columns with letters A and B, valence e- = number next to letter A.
If table has columns with numbers 1-18, Groups 1-2: valence e- = group number
•Groups 13-16: Valence e- = column number - 10.
Valence electrons of nonmetals
If table has columns with letters A and B, valence e- = number next to letter A.
If table has columns with numbers 1-18,
Valence e- nonmetals = column number - 10.