Question

The nitride ion in lithium nitride is composed of:

• A. 7 -protons +10 electrons
• B. 10 -protons +10 electrons
• C. 7 -protons +7 electrons
• D. 10 -protons +7 electrons

Answer 1

Answer: (A)

Nitride ion can be represented as $N^{3-}$.

Number of protons $=7$

Number of electrons $=7+3=10$

Therefore, nitride ions contain 7 -protons +10 electrons.