# The five successive ionization enthalpies of an element are

Question:

The five successive ionization enthalpies of an element are $800,2427,3658,25024$ and $32824 \mathrm{~kJ} \mathrm{~mol}^{-1}$. The number of valence electrons in the element is :

1. 5

2. 4

3. 3

4. 2

Correct Option: , 3

Solution:

As difference in $3^{\text {rd }}$ and $4^{\text {th }}$ ionisation energies is high so atom contains 3 valence electrons.