Arrangethe followingelementsin orderofdecreasingelectrongainenthalpy :

1.	Arrangethe followingelementsin orderofdecreasingelectrongainenthalpy : B, C,N , O.
Answer» Solution :N has +ve electron gainenthalpywhile allothershave-ve electrongainenthalpies. Sincesizedecrease inmoving from B `to C to O` thereforeelectron gainenthalpiesbecomemore andmorenegativefrom B `to C to O`. Thusthe OVERALL decreasingorderof electrongainenthalpiesis N ,B ,C, O

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