Ncert Exercises & Solutions

When an electron is added to O atom to form O–

ion, energy is released. Thus, the first

electron gain enthalpy of O is negative.

On the other hand, when an electron is added to O–

ion to form O2–

ion, energy has to be

given out in order to overcome the strong electronic repulsions. Thus, the second electron

gain enthalpy of O is positive.

${O^{‐}}_{(g)} + e^{‐} \to {O^{2 ‐}}_{(g)}$

$On the other hand, when an electron is added to O^{-} ion to form O^{- 2} ion,$
$energy has to be given out in order to overcome the strong electronic repulsions .$
$Thus, the second electron gain enthalpy of O is positive .$

3.22 What is the basic difference between the terms electron gain enthalpy and electronegativity?

When an electron is added to O atom to form O–

ion, energy is released. Thus, the first

electron gain enthalpy of O is negative.

On the other hand, when an electron is added to O–

ion to form O2–

ion, energy has to be

given out in order to overcome the strong electronic repulsions. Thus, the second electron

gain enthalpy of O is positive.

${O^{‐}}_{(g)} + e^{‐} \to {O^{2 ‐}}_{(g)}$

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