Find out the number of valence electrons for the element $X$. The successive ionization energies of

Question

Find out the number of valence electrons for the element $X$. The successive ionization energies of $X$ is given below. \ $ \begin{array}{ll} \mathrm{IE}_1: & 250 \mathrm{~kJ} \mathrm{~mol}^{-1} \ \mathrm{IE}_2: & 820 \mathrm{~kJ} \mathrm{~mol}^{-1} \ \mathrm{IE}_3: & 1100 \mathrm{~kJ} \mathrm{~mol}^{-1} \ \mathrm{IE}_4: & 1400 \mathrm{~kJ} \mathrm{~mol}^{-1} \end{array} $

Professor PC Thomas Classes · Answer

A massive ionization energy jump signifies removing a core electron. The large jump after $IE_1$ indicates 1 valence electron.