Question

Atomic number of $N$ is $7$ and of oxygen is $8$. Total number of electrons in ${NO}_3^{-}$ ion is:

• A. 32
• B. 24
• C. 33
• D. 35

Answer 1

The correct option is A 32

Number of electrons in nitrogen = 7 and number of electron is oxygen = 8 we know that formula of nitrate ion is ${NO}_3^{-}$

We also know that number of electron = (1 × Number of electrons in nitrogen) + (3 × number of electrons in oxygen) + 1 = (1 × 7) + (3 × 8) + 1 = 32.

Hence the answer is 32.