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Ionisation Energy

The element w...

Question

The element whose II (I.P.) is less than its I (I.P.):

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None

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Solution

The correct option is C None
None of the elements Li, Be and He have second ionisation potential lower than first ionisation potential. The second ionisation potential is always higher than the first ionisation potential because, in second ionisation potential, an electron is to be removed from unipositive cation. There is strong electrostatic force of attraction present between the unipositive cation and the added electron. This makes removal of second electron difficult and requires large amount of energy.

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