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The first ionisation potential of AI is ...

The first ionisation potential of AI is smaller than that of Mg because:

A

The atomic size of Al gt Mg.

B

The atomic size of Al lt Mg.

C

Al has one unpaired electron in 3p-orbital.

D

Mg has incompletely filled 3s-orbital.

Text Solution

Verified by Experts

The correct Answer is:
C
Penetration of p-subshell electron is less than s-subshell electrons. Thus 3s electron of magnesium is closer to the nucleus as compared to the 3p electron of aluminium
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