Question

While the ionization energies of S block elements

decreases regularly as we move down the group, it is not

the case in p block elements. Why is it so

Answer 1

Explanation:

because , in S block the electron move far from nucleus thus effective nuclear charge decreases and the S block lose electron to be stable and thus energy required i.e ionization energy decreases

while P block elements mostly gain electrons to attain stability thus they attract electrons towards nucleus thus moving down size increases although the ionization energy increases