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The increasing order of the first ionisa...

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

A

`F lt S lt P lt B`

B

`P lt S lt B lt F`

C

`B lt P lt S lt F`

D

` B lt S lt P lt F`

Text Solution

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The correct Answer is:
D
In general as we move from left to right in a period, the ionisation enthalpy increases with increasing atomic number. The ionisation enthalpy decreases as we move down a group. `P(1s^(2)2s^(2)2p^(6) 3s^(2)3p^(3) )` has a stable half filled electronic configuration hence its ionisation enthalpy is higher than that of S.
`:.` Increasing order of ionisation energy is `B lt S lt P lt F`
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