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- #Classification of Elements and Periodicity in Properties
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 H than B
Answers (1)
The electronic configuration of Be is . The outermost electron is present in the s-orbital. Whereas, in B the electronic configuration is
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 H than B.
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