Which of the following noble gases has the highest positive electron gain enthalpy value? (a) Helium
Which of the following noble gases has the highest positive electron gain enthalpy value?
(a) Helium (b) Krypton (c) Argon (d) Neon
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(d) Electron gain enthalpy for noble gases is positive and it becomes less 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 positive electron gain enthalpy.
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