Concept:Electron affinity is the energy change when an electron is added to an isolated gaseous atom.
Explanation:The process involves a neutral gaseous atom accepting one electron.
This can be represented as
X(g)+e−→X−(g).
The energy released or absorbed in this process is called electron affinity.
It is not atomization, which converts molecules into atoms.
It is not electronegativity, which measures attraction for electrons in a bond.
It is also not ionization energy, which is the energy needed to remove an electron.
Therefore, the correct term for the energy accompanying electron addition is electron affinity.
Answer:C. Electron affinity