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Question
The order of first electron affinity of O,S and Se is:
The order of first electron affinity of O,S and Se is:
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Solution
The correct option is B S>O>Se
Electron affinity decreases down the group the
group, but 'O' has small atomic size and 2p-orbital becomes very compact and
already has 6 electrons , hence, there is a repulsive force among the already
present and added electrons. Some of the energy evolved, due to addition of
electron is used to reduce the repulsion. Hence, the E. 0A. Of O is less than S, so the order is S >O>Se.
Electron affinity decreases down the group the group, but 'O' has small atomic size and 2p-orbital becomes very compact and already has 6 electrons , hence, there is a repulsive force among the already present and added electrons. Some of the energy evolved, due to addition of electron is used to reduce the repulsion. Hence, the E. 0A. Of O is less than S, so the order is S >O>Se.
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