Question

Account for the following : (a) The ionic radius of fluoride ion (F- ) is 136 pm, while the atomic radius of f luorine (F) is only 6

Answer 1

Answer:

In its 2p5 configuration, the unpaired electron keeps shuttling among the otherwise degenerate 2px, 2py and 2pz orbitals making all these p orbitals elctronically indistinguishable. This is one kind of resonance which has the feature of stabilisation. Stable orbitals are shrunken towards the nucleus. Hence the psi square function is maximum at 64 pm or 0.64 A. One more possibility is the I-s (Nuclear and Electron magnetic) spin coupling. Once the extra electron is added the, 2px, 2py and 2pz are filled with lone pairs of electrons with no scope for coupling and resonance. Further, Valence Shell Electron Pair Repulsion (VSEPR) invokes keeping the 3 p orbitals stretched apart thereby making the effective radius enhanced.

Explanation:

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