Question

The order of first electron affinity of o s and se is

Answer 1

Answer:

maximum electron affinity is S then Se and then O.

Answer 2

The order of first electron affinity is : O> S> Se

Explanation:

Electron affinity is the amount of energy required when an electron is added to a gaseous neutral atom to form a negative ion. This is expressed in kJ/mol.

$X(g)+e^-\rightarrow X^-(g)$

Electron affinity decreases as we move down the group as the size of the atom increases as we move down the group because a new shell is added and electron gets added up.

As, the size of an element increases, the valence electrons gets away from the nucleus. So, the attraction between the nucleus and the incoming electron decreases.

Thus the order of first electron affinity is : O> S> Se

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