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The first ionisation potential of Al is ...

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

A

atomic size of `Al gt Mg`

B

atomic size of `Al lt Mg`

C

`Al` has electron in the `p-`orbtial

D

atomic number of `Al gt Mg`

Text Solution

Verified by Experts

The correct Answer is:
C
In aluminium less penetrating p-electron is to be removed while in Mg, more penetrating s electron is to be removed.
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