Although Boron (B) is smaller in size than barellium (BE) But 1st ionization enthalpy of Barellium (be) is higher than Boran(b) why? call for answer@9582489391

Although Boron (B) is smaller in size than barellium (BE) But 1^st ionization enthalpy of Barellium (be) is higher than Boran(b) why? call for  answer@9582489391

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