Element X has the ground-state electron configuration

CHEMISTRY · Subjective · AP · Chemistry · Atomic Structure and Properties · Atomic Structure and Properties

Problem

1s^{2}2s^{2}2p^{6}3s^{1}

. The average distance of a

3s

electron from the nucleus is

4.8 \times 10^{-10}\,\text{m}

, while that of a

2p

electron is

1.9 \times 10^{-10}\,\text{m}

. Calculate the approximate ratio

\dfrac{IE_{2}}{IE_{1}}

for element X and, in one sentence, state the main reason for the difference between the two ionization energies.