Question

Why is the electron gain enthalpy of O or F less than that of S or Cl ???

pls solve this answer...
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Answer 1

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The electron gain enthalpy of O or F less than that of S or CI and is due to smaller size of O/F the inter-electronic repulsion in compact 2p-orbitals is much more than the repulsion in 3p-orbitals of S/Cl hence, the incoming new electron feels less attraction in O/F and more attraction in S/Cl. Due to this the addition becomes difficult in O/F and electron gain enthalpy becomes less than S/Cl.

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