Question

Why do the first and the second ionization energies of group 14 elements decrease from carvon to tin whereas the third and the fourth ionization energies vary irregularly?

Answer 1

Ionization enthalpy decreases in a group because as we proceed from up to the down the attraction of the valence electrons from the nucleus decreases ..
HOPE THIS ANSWER IS HELPFUL FOR U!!!!

Answer 2

Explanation:

ionization energy increases across a period and decreases down a group. Across a period, effective nuclear charge increases as electron shielding remains constant.

HOPE this helps ☺️