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The increasing order of the first ionisa...

The increasing order of the first ionisation enthalpies of the elements B, P, S and F is

A

`BltPltSltF`

B

`BltSltPltF`

C

`FltSltPltB`

D

`PltSltBltF`

Text Solution

Verified by Experts

The correct Answer is:
B
B and F lie in the second period while P and S lie in the third period. Because of higher effective nuclear charge, `Delta_(i) H_(1)` of P and S are higher than that of B but lower than that of F. among P and S , P has higher `Delta_(i)H_(1)` due to exactly half filled configuration. `:.` overall increasing order of `Delta_(i) H_(1)` is BltSltPltE i.e. (B) is correct
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