Although boron (B) is smaller in size than barellium(Be) but 1st ionisation enthalpy of Barellium(Be)is higher than boron(B)why
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Be has atomic number 4 and B has atomic no. 5.
By quantum theory, its configuration could be as:
Be=1s^2 2s^2 and
B= 1s^2 2s^2 2p^1
This shows that Be has two shells full but B has 1 electron in next shell too,
and acc. to Hund's rule that half filled or fully filled orbital is more stable than un-filled orbital, Be is more stable and wants more 1st ionization enthalpy.
By quantum theory, its configuration could be as:
Be=1s^2 2s^2 and
B= 1s^2 2s^2 2p^1
This shows that Be has two shells full but B has 1 electron in next shell too,
and acc. to Hund's rule that half filled or fully filled orbital is more stable than un-filled orbital, Be is more stable and wants more 1st ionization enthalpy.
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