Question

Beryllium has higher ionisation enthalpy than boron. This can be explained as,

• A. Beryllium has higher size than boron hance its ionisation enthalpy is higher
• B. Penetration of 2p – electrons to the nucleus is more than the 2s – electrons
• C. It is easier to remove electron from 2p – orbital as compared to 2s – orbital due to more penetration of s – electrons
• D. Ionisation energy increases in a period.

Answer 1

Answer: (C)

It is easier to remove electron from 2p – orbital as compared to 2s – orbital due to more penetration of s – electrons

Answer 2

: $4Be - 1s^{2}2s^{2}$

$5B - 1s^{2}2s^{2}2p^{1}$