In comparison to B, Be has

Options

A. lesser nuclear charge and greater first ionisation enthalpy
B. lesser nuclear charge and lesser first ionisation enthalpy
C. greater nuclear charge and greater first
D. greater nuclear charge and lesser first ionisation enthalpy.

Answer

A

Explanation

In case of Be electron is to be removed from filled 2s subshell while in case of B, the electron is to be removed from outer 2p subshell `(2s ^(2)2p ^(1)).` Hence, Be has higher ionization enthalpy than B though its nuclear charge is less.