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Which of the following statements is wro...

Which of the following statements is wrong?

A

The first ionisationpotential of `Al` is less than the first ionisation potential of `Mg`.

B

The second ionisation potential of `Mg` is greater than the second ionisation potential of `Na`

C

The first ionisation potential of `Na` is less than the first ionsation potential of `Mg`.

D

The third ionisation potential of `Mg` is greater than the third ionisation potential of `Na`

Text Solution

Verified by Experts

The correct Answer is:
B
`Na(Z=1) : 1s^(2) 2s^(2) 2p^(6) 3s^(1)`
`Na^(o+): 1s^(2) 2s^(2) 2p^(6)`
After losing the first electron, sodium acquires a very stable noble gas configuration. Therefore, its second ionisation potential is very high. So, it is incorrect to say that the second ionisation potential of Mg is greater than the second ionisation potential of Na.
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