Question

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

• A. beryllium has higher size than boron hence 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