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A large difference between second and third ionization energies will be observed for the element having electronic configuration of

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a

$(1 s)^{2} (2 s)^{2} (2 p)^{6} (3 s)^{1}$

b

$(1 s)^{2} (2 s)^{2} (2 p)^{6} (3 s)^{2} (3 p)^{2}$

c

$(1 s)^{2} (2 s)^{2} (2 p)^{6} (3 s)^{2}$

d

$(1 s)^{2} (2 s)^{2} (2 p)^{6} (3 s)^{2} (3 p)^{1}$

answer is B.

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Detailed Solution

There must be two valence electrons in the element if there is a significant difference between the second and third ionisation potentials. The element will adopt a stable noble gas structure after losing two electrons. The electron is hard to get out of the stable noble gas structure.

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A large difference between second and third ionization energies will be observed for the element having electronic configuration of