s-Block ElementsHard

Question

The first ionisation potential (eV) of Be and B respectively are :

Options

A.8.29, 9.32
B.9.32, 9.32
C.8.29, 8.29
D.9.32, 8.29

Solution

Be has higher ionisation energy than boron because of stable completely filled valence shell, 2s2 as compared to less stable partially filled valence shell, 2s2 2p1.

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