Question

Why do noble gases have zero value of electron affinity?

Answer 1

Electron affinity of an element is the energy released when an element in the gas phase gains an extra electron to form an anion. Noble gases have a completely filled valence shell and does not require any extra electron to become stable and so has a zero electron affinity

Answer 2

Noble gases have zero value of electron affinity as their octet is complete.

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.

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

Noble gases have general electronic configuration of :$ns^2np^6$

As the sub-shells of noble gases is fully filled and their octet is complete. Hence, it will not require any extra electron to form negative ion. Thus have zero electron affinity.

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