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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

`Na lt Mg gt Al lt Si`

B

`Na gt Mg gt Al gt Si`

C

`Na lt Mg lt Al gt Si`

D

`Na gt Mg gt Al lt Si`

Text Solution

Verified by Experts

The correct Answer is:
A
Ionisation energy increases from left to right in a period.
However, exception occur between group 2 and group 13 elements on account of stability of electronic configuration of valence shell.

`implies` The desired order is `Na lt Mg gt AI lt Si`
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