Assertion: Boron has a smaller first ionisation enthalpy than beryllium. Reason:
Channel: Doubtnut
Date: 2020-01-19

Assertion: Boron has a smaller first ionisation enthalpy than beryllium. Reason: The penetration of a `2s` electron to the nucleus is more than the `2p` electron, hence `2p` electorn is more shielded by the inner core of electrons than the 2s electrons.