Question

27. Two elements A and B have following electronic following electronic configuration.
A = 1s2 2s2 2p6 3s2
B = 1s2 2s2 2p6 3s2 3p3
If expected compound formed by A and B is AxBy ,then sum of x and y is
(a) 2
(b) 3
(c) 4
(d) 5

Answer 1

Answer: A is having 2 e- in the outer most shell and B is having 3 e-..

Their formula will be A3B2

So the value of x is 3 and y is 2 and therefore the sum of x and y is 3+2=5

And the compound must b Mg2P3 magnesium phosphide...

Hopes it will help you out!!!!