The electronic configuration of elements $A, B$ and $C$ are $[\mathrm{He}] 2 s^1,[\mathrm{Ne}] 3 s^1$ and [Ar] $4 s^1$ respectively, which one of the following order is correct for the first ionization potentials (in $\mathrm{kJ} \mathrm{mol}^{-1}$ ) of $A, B$ and $C$ ?

Question

Aicharya · Accepted Answer

Ionisation potential of $A, B$ and $C$ elements decreases with the ease of removal of electron from $A$ to $C$. Atomic size increase from $A$ to $C$, hence ionisation potential decrease in the same order. So, order of ionisation potential is $A>B>C$ ,

The electronic configuration of elements $A, B$ and $C$ are $[\mathrm{He}] 2 s^1,[\mathrm{Ne}] 3 s^1$ and…

Solution