The increasingorder of thefirstionizationenthalpyfo the elementB, P, S

1.	The increasingorder of thefirstionizationenthalpyfo the elementB, P, S andF (lowestfirst )is
Answer» `B lt Plt S lt F` `b lt S lt P lt F` `F lt S lt P lt B` `P lt S lt Blt F` SOLUTION :B andF liein the 2ndperiodwhileP andS LIE in charge `Delta_(i) H_(1) `ofP andS arehigherthan thatof Bbut lowerthan thatof F. AmongP andS, P hashigher `Delta_(i) H_(1) ` due toexactly HALF- filledconfiguration.Thusthe overall INCREASINGORDER of `Delta_(i) H_(i)` is: `B lt S lt P lt F` , i.e.,option ( b)is correct.

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