Step 1: Nitrogen (EN = 3.0) is less electronegative than oxygen (EN = 3.5), so nitrogen is the central atom.
Step 2: NO2- has a –1 charge, which means it gained an electron. The total number of valence electrons present in the molecule is:
Group Valence Electrons
N 5A 1 × 5 e– = 5 e–
O 6A 2 × 6 e– = 12 e–
From –1 charge: – 1 e–
Total: 18 valence e–
With what allotrope of oxygen is NO2- isoelectronic?
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