Question

Which transition involves maximum amount of energy?

(a) $M_{(g)}^{-} \rightarrow M_{(g)}+e^{-}$

(b) $M_{(g)}^{-} \rightarrow M_{(g)}^{+}+2 e^{-}$

(c) $M_{(g)}^{+} \rightarrow M_{(g)}^{2+}+e^{-}$

(d) $M_{(g)}^{2+} \rightarrow M_{(g)}^{3+}+e^{-}$

Answer 1

The correct option of this question will be (d).

Explanation —

When an electron is removed from an isolated gaseous atom it forms a cation in which electrons become less but nuclear charge remains same thus, the electrons are more tightly bounded in cations. Hence, energy required to pull out these electrons is higher.

$ I E_3>I E_2>I E_1$