| Electron gain enthalpy | Electronegativity |
| $1$. It can be measured. | $1$. It cannot be measured. |
| $2$. The change in enthalpy when $1$ electron is added to a gaseous atom is known as electron gain enthalpy. | $2$. The capacity to attract a shared pair of electrons in a covalent bond is known as electronegativity. |
| $3$. It represents the enthalpy change of the reaction $X_{(g)} + e^{-} \rightarrow X^{-}_{(g)}$. | $3$. Its value is relative and denoted by scales like Pauling's scale (electronegativity of fluorine is $4.0$). |
| $4$. It indicates the energy released or absorbed when an electron is added. | $4$. It indicates the relative tendency of an atom to attract shared electrons. |
| $5$. Its value is a property of an isolated gaseous atom. | $5$. Electronegativity is not constant; it depends on the chemical environment and the atom it is bonded to. |
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