Question

(a) Arrange the following as per the instructions given in the brackets
(iii) Na, K, Cl, S, Si (Increasing order of ionization energy)

Answer 1

Ionization energy:-

• It is the energy required to remove an electron from the valence shell of an atom in its isolated gaseous state.
• Ionization energy increases across a period from left to right due to smaller atomic sizes and decreases down the group.
• Increasing order of ionization energy is - $\mathrm{K}<\mathrm{Na}<\mathrm{Si}<\mathrm{S}<\mathrm{Cl}$