1.

Which ofthe followingelementshas mostpositiveelectrongainenthalpy ?Fluorinenitrogen neon.

Answer»

SOLUTION :Bothnitrogenand neonhave positive electrongainenthalpies. Butneonhas muchhigherpositiveelectron gain enthalpy because of itsmuch morestable INERTGAS CONFIGURATION than the lessstableexactlyhalf-filledelectronicconfigurationof nitrogen.
Alternatively in NEON , the newelectronhas to beplacedin a muchhigherenergy 3S- orbital of the newshellwhilein case of N , thenewelectronis toplacedin the 2p-orbital of the sameshell.


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