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Question

The values of IP1,IP2,IP3 and IP4 of an atom are 7.5 eV, 25.6 eV, 48.6 eV and 170.6 eV respectively. The electronic configuration of the atom will be:

A
1s2, 2s2, 2p6, 3s1
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B
1s2, 2s2, 2p6, 3s2, 3p1
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C
1s2, 2s2, 2p6, 3s2, 3p3
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D
1s2, 2s2, 2p6, 3s2
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Solution

The correct option is B 1s2, 2s2, 2p6, 3s2, 3p1
Whenever there is a sudden increase in the ionisation potential, it indicates that the species had a stable configuration.
It is given that Ip4>>>Ip3, which indicate that the species attained stability by loosing 3 electrons.
So, option (b) represents this high energy change due to the removal of the fourth electron from a fully filled 2p6 orbital.

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