1.

Which of the following noble gases has the highest negative electron gain enthalpy value ?

Answer»

Helium
Krypton
Argon
Neon

Solution :ELECTRON gain enthalpy for noble gases is POSITIVE and it BECOMES Jess positive with increase in size of atom Value of electron gain enthalpy
`He- 48 " kJ MOL"^(-1), Ne- 116 " kJ mol"^(-1)`
Ar, `Kr-96 " kJ mol"^(-1), Xe-77 " kJ mol"^(-1)`
Hence, Ne has highest NEGATIVE electron gain enthalpy.


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