Chemical Bonding

QThe Process requiring the absorption of energy

a] F - F-

b] H - H-

c] Cl - Cl-

d] O- O 2-

Ans is [d] .Xplain how .

Actually, all the elements can easily gain electron to for ions like in H, F, Cl or O-atoms.
But, all the rest atoms except oxygen accepts only one electron so , they release energy and the value of electron gain enthalpy is negative. 
But, oxygen first add one electrons where its first electron gain enthalpy is negative, but now the second electron is added to an anion, so that will require energy to add and hence the electron gain enthalpy becomes positive.

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