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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 lt Si`

D

`Na gt Mg gt Al lt Si`

Text Solution

Verified by Experts

The correct Answer is:
A
`Na(3s ^(1)) lt Mg (3s ^(2))gt Al(3s ^(2)3p ^(1)) lt Si (2s ^(2) 3p ^(2))`
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