Question

Successive ionization potentials of a metallic element 'M' are 520 kJ, 7300 kJ, 10100 kJ, 13500 kJ respectively. Identify the formulae of compounds when it combines with non-metals X and Y. 'X' contains 7 electrons in valence 'M' shell and 'Y' contains 6 electrons in valence 'N' shell.

• A. $M_{2}X,MY$
• B. $M{X}_2,M{Y}_2$
• C. $MX,MY$
• D. $MX,M_{2}Y$

Answer 1

The correct option is D $MX,M_{2}Y$

The $IE2$ is very high compared to $IE1$

. Thus M attains inert gas configuration on removal of $1$ electron

Hence its valency is $1$. Valency of X is $1$ as it needs $1$ electron to complete its octate and similarly valency of Y is $2$. Thus M forms $MX$ and $M_{2}Y$