1.

Which of thefollowingordersaboutionizationenergyis correct?

Answer»

`N gt O gt F `
`N LT O lt F`
`N gt O lt F`
`N lt O gt F`

Solution :Ingeneral as thenuclearchargeincreasesfromleft to rightin periodtheionizationenthalpyincreasesaccordingly.ButionizationenthalpyofN is highestthan thatof O due to greaterstabilityof theexactly half- filledelectronicconfigurationof the2p-orbitals`(1s^(2)2s^(2)2p_(x)^(1)2p_(y)^(1) )` INN atom. Thereforeamongst N, O andatoms, the ionizationenthalpyof O is thelowesti.e.,option( c) iscorrect.


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