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Q.

The first four successive ionization energies for an element are 6.113, 11.871, 20.908 and 67.1 (in eV) respectively. The number of valence shell electrons is

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answer is 3.

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Detailed Solution

We can see a sudden jump in the IE-4, it indicates that three electrons are lost very easily. Hence it belongs to IIIA group.
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