Question

why is electron affinity negative?​

Answer 1

Explanation:

Electron Affinity is the energy associated with the addition of an electon to a gaseous atom. Notice the sign on the energy is negative. This is because energy is usually released in this process, as opposed to ionization energy, which requires energy.

Answer 2

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Electron affinity is defined using Electron gain enthalpy which is the energy change that occurs when an electron is accepted by an isolated atom in  the gaseous state to form an anion. A negative electron gain enthalpy signifies the energy liberated. The electron affinity is just the negative of the enthalpy change i.e. if electron gain enthalpy is positive for endothermic process then the electron affinity will be negative and vice versa.

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