The pronounced change from non-metallic to metallic behaviour and also increase in the basicity of oxides from nitrogen to bismuth in group 15 is principally due to increasing size of the atoms. The ionisation potential of nitrogen is very high on account of its small size. However, ionisation potential decreases regularly on descending the group.
In all the group 15 elements, the number of unpaired electrons in the valence shell is:

Options

A. 4
B. 3
C. 2
D. 5

Answer

B

Explanation

3