Given electronic configuration of four elements as (I) `1s^2` (II) `1s^2 2s^2 2p^2`, (III) `1s^2 2s^2 2p^5` and (IV) `1s^2 2s^2 2p^6`. The one which is capable of forming ionic as well as covalent bonds is

Options

A. I
B. II
C. III
D. IV.

Answer

C

Explanation

III `1s^2 2s^2 2p^5` is fluorine.
Na-F is ionic bond.
F-F is covalent bond.