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

InterviewSolution

1.	The first ionisation potential of `Na,Mg,Al` and `Si` are in the orderA. `NaltMg gtAlltSi`B. `NagtMggtAlgtSi`C. `NaltMgltAlltSi`D. `NagtMggtAlltSi`
Answer» Correct Answer - 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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