Question

The Ionization Energy of Beryllium is
more than that of Boron, because
Beryllium has
1) more nuclear charge
2) less screening effect
3) more penetration power of '2s' than '2p'
4) more atomic radius​

Answer 1

Explanation:

This is the energy per mole necessary to remove electrons from gaseous atoms or atomic ions.

...

1st–10th ionisation energies.

number 4

symbol Be

name beryllium

1st 899.5

2nd 1757.1