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The order of first ionization energies o...

The order of first ionization energies of the elements Li,Be,B,Na is :

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The correct Answer is:
B
Ionization energies increase in a period on moving left to right while it decreases in a group on moving downward. The I.E. of Be is greater than B due to completely filled s-orbital . Hence the order of IE is as: Be> B > Li > Na
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