Question

In the ground state of phosphorus total number of unpaired electrons are:

• A. 3
• B. 5
• C. 8
• D. 9

Answer 1

Answer: (A)

Phosphorus (at. no. $=15$ ) Electronic configuration $=1s^{2}2s^{2}2p^6,3s^{2}3p^3$ Number of unpaired electrons $=3$