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The first ionisation enthalpies of Na,Mg...

The first ionisation enthalpies of Na,Mg, Al and Si order

A

Na < Mg < Al < Si

B

Na < Mg >Al < Si

C

Na < Mg < Al < Si

D

Na < Mg < Al < Si

Text Solution

Verified by Experts

The correct Answer is:
A
The valence electron configurationsar:
`Na(3s^(1)),Mg(3s^(2)),Al(3s^(2)3p^(1)),Si(3s^(2)3p^(2))`
Mg experiences more nuclear attraction thanNa. Al valence electrons `(3p^(1))` has more energy than the 3s valence electron of Mg and therefore lesser I.E. Si valence electron `(3p^(2))`experience more attraction than Al.
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