Question

A neutral atom of certain elements has 15 electrons. How many unpaired electrons does it have?

• A. 1
• B. 3
• C. 5
• D. 2

Answer 1

The correct option is B 3

As its atomic no is 15, so, EC:
$1s^{2}2s^2{p}^{6}3s^2{p}^3$
As it needs 3 electrons to complete its octet so it is a non-metal.
Also, as it have 3 unpaired electrons so it is paramagnetic in nature.