Second electron gain enthalpy is always positive for every element because to overcome repulsion between an anion and electron, energy has to be supplied.
O−+e−→O−2;ΔHeg=+ve
When the first electron gain enthalpy (ΔHeg) of oxygen is −141kJ/mol , its second electron gain enthalpy is:
Held on 9 Jan 2019 · Verified 6 Jul 2026.
A positive value
Almost the same as that of the first
Negative, but less negative than the first
A more negative value than the first
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