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The first ionisation potential of Na,Mg,...

The first ionisation potential of `Na,Mg,Al` and `Si` are in the order

A

`NaltMg gtAlltSi`

B

`NagtMggtAlgtSi`

C

`NaltMgltAlltSi`

D

`NagtMggtAlltSi`

Text Solution

Verified by Experts

The correct Answer is:
A
`IE_(1)` of Mg is higher than that of Na because of increased nuclear charge and also that of Al because in Mg a 3s-electron has to be removed while in Al it is the 3p-electron. The `IE_(1)` of Si is, however, higher than those of Mg and Al because of it increased nuclear charge. Thus, the overall order is `NaltMg gtAl ltsi`.
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