Question

The first ionization energy of boron is less than that
of beryllium because
1) Boron has higher nuclear charge
2) Atomic size of boron is more than that of beryllium
3) Boron has only one electron in p-sub-shell
4) Atomic size of boron is less than that of beryllium​

Answer 1

3 option is correct ....
Be-2s2 and B-2p1

Answer 2

Answer:

Ans 3 is correct as boron has hybridization 1s² 2s²2p¹ while beryllium has 1s² 2s²

So it will easy to remove electron from boron