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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

NaltMggtAlltSi

B

NagtMggtAlgtSi

C

NaltMgltAlltSi

D

NagtMggtAlltSi

Text Solution

Verified by Experts

The correct Answer is:
A
As we move across the period,atomic size decreases hence,ionization enthalpy increases.But for Al`(3s^(2)3p^(1))`,electron has to be removed from outer 3p orbital whereas in Mg`(3s^(2))`,electron has to be removed from stable fully filled 3s orbital.Thus,I.E. for MggtAl.So,the correct order of first ionization enthalpies is: NaltMggtAlltSi.
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