Question

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Answer 1

Hey

1. The elements A,B and C follows the law of Triads

According to the law of traids the mass of one element is equal to the average mass of other two elements

One example of law of Triads is Litium(Li),Sodium(Na) and Pottasium(K)

We know that Litium sodium and Pottasium belongs to 1st group and has similar properties

The mass of Litium = 7

The mass of sodium = 21

The mass of Pottasium = 39

= 39 + 7 / 2 = 46/2 = 23

Which approximately equal to 21

The average mass of Li and K is approximately equal to the mass of Na

2.

valency of A = +1

It belongs to 1st group

Valency of B = +2

It belongs to 2nd group

valency of C = 0

It belongs to 18th group or 0 group which is a noble gas