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Q.

The INCORRECT order of decreasing first ionization energy is:

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a

Si> Al> Mg> Na

b

Si> Mg> Al> Na

c

Al> Si> Mg> Na

d

Mg> Li >Al> Si

answer is A.

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Detailed Solution

I.E.1=Ar>Cl>PHalf filled>S>Si>Mg3g2>Al>Na                                   configurationSimilar I. E.1 observation in 2nd period elements.
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