Question

Two elements X and Y have following electronic configurations

X = 1s², 2s² 2p⁶, 3s² 3p⁶, 4s² and Y = 1s², 2s² 2p⁶, 3s² 3p⁵.

The expected compound formed by combination of X and Y is

(a) XY₂

(b) X₅Y₂

(c) X₂Y₅

(d) XY₅

Answer 1

Correct option is (a) XY₂

X-atom transfers its 2 electrons of the valence shell to two atoms of Y for the completion of octets.