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Question

Which one of the following pairs of the element has the second element with greater first ionization energy?

A
P, As
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B
Si, Ge
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C
Al, Ga
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D
S, Se
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Solution

The correct option is C Al, Ga
Gallium-Ga-outermost valence shell electronic configuration-4s24p1
Aluminium-Al-outermost valence shell electronic configuration-3s23p1
Before valence shell configuration, Ga(10) electrons are filled in dorbitals which has poor shielding effect. So effective nuclear charge will increase and hence Ga will be smaller in size than Al.
As nuclear charge is more, it is difficult to remove an electron from outermost shell of Ga, hence ionization energy is more than Al.

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