According to the Mulliken scale, electronegativity is defined for an isolated gaseous atom. Which of — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

Mulliken defined electronegativity as the arithmetic mean of the first ionization energy (IE) and the electron affinity (EA). IE corresponds to $X_{(g)} \rightarrow X^+_{(g)} + e^-$, and EA corresponds to the energy released in $X_{(g)} + e^- \rightarrow X^-_{(g)}$.