Question
Chemistry Question on Classification
In comparison to boron, berylium has :
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 ionisation enthalpy
D
greater nuclear charge and lesser first ionisation enthalpy
Answer
lesser nuclear charge and greater first ionisation enthalpy
Explanation
Solution
In case of 'Be' electron remove from '2s' orbital while in case of 'B' electron remove from '2p' orbital. '2s' orbital have greater penetration effect then '2p' orbitals. So 'Be' having more I.E. then 'B'