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  • Among the second period elements the actual ionization enthalpies are in the order Li < B < Be < C < O < N < F < Ne. Explain why Be has higher  i H than B

3.16   Among the second period elements the actual ionization enthalpies are in the order Li < B < Be < C < O < N < F < Ne. Explain why (i)   Be has higher \Delta _ i H than B

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The electronic configuration of Be is (1s^22s^2). The outermost electron is present in the s-orbital. Whereas, in B the electronic configuration is (1s^22s^22p^1) here outermost electron is present in p-orbital.

The electrons in s-orbital are more tightly attracted by the nucleus than the p-orbital, as a result, more amount of energy is required to knock out a s-orbital electron.

Hence Be has higher \Delta _ i H than B.

Posted by

Divya Prakash Singh

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