Question
Which element has higher electron affinity among O and S? Why?
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Answer
- Oxygen has less negative electron gain enthalpy, due to high electronegativity, low atomic size and high electron density so that the incoming electron is repelled.
- Electron gain enthalpy of the elements decreases down the group due to successive decrease in electronegativity and nuclear attraction and increase in atomic size.
Element Po O Electron gain enthalpy
$kJ / mol$$-175$ $-141$
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