Question

Although boron (B) is smaller in size than barellium (Be). but Ist ionization enthalpy of Barellium (Be) is higher था than Boran (B) Why.

Answer 1

because Berelium electronic arrangement is 1s2 2s2 the last orbital is filled complety buy in Boron it is 1s2 2s2 2p1.. so we can get electron easily from Boron instead of Berelium.. so ionization enthalpy of Be is higher than B