For `p`-block elements, the normal valence (or group valence is equal to the number of valence electrons only for_______elements
(i) group `17` (ii) group `15`
(iii) group `14` (iv) group `13`

Options

A. `(i),(ii),(iii),(iv)`
B. `(i),(ii),(iii)`
C. `(ii),(iii),(iv)`
D. `(iii),(iv)`

Answer

D

Explanation

The normal valence of group `13` elements `(ns^(2)np^(1))` is `3` while the normal valence of group `14` element `(ns^(2)np^(2))` is `4`.