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Arrange in order of increasing I.P....

Arrange in order of increasing I.P.

A

`MgltAlltSiltP`

B

`AlltSiltPltMg`

C

`SiltPltMgltAl`

D

`AlltMgltSiltP`

Text Solution

Verified by Experts

The correct Answer is:
D
All of these elements belong to 3rd period. Mg(Z=12) , Al(Z=13), Si(Z=14),P(Z=15), Mg(`1s^(2)2s^(2)2p^(6)3s^(2)`) and `P(1s^(2)2s^(2)2p^6)3s^(2)3p^(3))` due to fully fille dand haf fille subshells have high `I.E_(1). I.E_(1)` in general increases in a period from left to right. thus, correct ordre of `I.E_(1)` is
`Al(I.E_(1)=577) lt Mg (I.E_(1)=738) lt si (I.E_(1) " values are in kJ " mol^(-1))`
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