Which of the following sets of three elements (triads) follow D`ddot(o)`bereiner's relatiship referred to as the law of triads?
`(i) Ca,Sr, Br` (ii) `Li, Na, K`
(iii) `S, Se, Te` (iv) `C1, Br, I`

Options

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

Answer

D

Explanation

The classification of elements into triads has a great significance in predicting the atomic mass and properties of the middle element. However, only a few elements could be arranged in such triads.