Which of the noble gases can be described in terms of either covalent radii or van der Waals radii?
(i) `Xe` (ii) `Ar`
(iii) `Kr` (iv) `Ne`

Options

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

Answer

A

Explanation

Noble gases except `Xe` and `Kr` do not form chemical compounds. Therefore, the atomic radii of `Xe` and `Kr` can be expressed in terms of either van der Waals radii or covalent radii. `Xe` and `Kr` ussually form compounds with fluorine and oxygen.