Question

why do the first and second ionization energies of group 14 elements decreases from carbon to tin whereas the third and the fourth ionization energies vary irregularly

Answer 1

It is because as we move down a group atomic size increases..hence. .I.P decreases
Secondly as we move from left to right the nuclear charge increases so I. P increases..
When the atomic size is more the attractive force between the no clues and shells is less and wen n.c is mire the attractive force is more..


Hope this helped