In the Lewis dot structure for NO₂⁻, total number of valence electrons around nitrogen is ________.

(JEE Main 2024 – 5th April Morning Shift)

Correct Answer: 8

Total valence electrons in NO₂⁻ are calculated as:

• Nitrogen = 5 electrons
• Oxygen (2 atoms) = 12 electrons
• Extra electron due to negative charge = 1

Total = 18 valence electrons

In the Lewis structure, nitrogen forms one double bond and one single bond with oxygen and also has one lone pair.

• Double bond = 4 electrons
• Single bond = 2 electrons
• Lone pair = 2 electrons

Therefore, total number of valence electrons around nitrogen = 8.