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  4. Which electronic configuration of an element has abnormally high difference between second and third ionisation energy?

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Q. Which electronic configuration of an element has abnormally high difference between second and third ionisation energy?

AIPMTAIPMT 1993Classification of Elements and Periodicity in Properties

Solution:

When the element having $1s^2, 2s^2 2p^6, 3s^2$ configuration, loss two electrons, then it acquire the electronic configuration of noble gas (Ne), so to remove third electron a large amount of energy is required and hence, its second and third ionisation energy have large difference.