why noble gases have large positive electron gain enthalpies
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Here's the answer you are looking for
Noble gases have fulfilled Valence shell, that means they are stable and don't take part in chemical reactions or bond formation in order to stabilize them.
Hence they don't need electron nor have affinity towards electrons.
If the electron affinity is very less then the electron gain enthalpy is high that is if electron affinity is negative electron gain enthalpy is positive and vice versa.
Since the electron affinity noble or inert gases, is very less that is largely negative; there electron gain enthalpy largely positive.
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Here's the answer you are looking for
Noble gases have fulfilled Valence shell, that means they are stable and don't take part in chemical reactions or bond formation in order to stabilize them.
Hence they don't need electron nor have affinity towards electrons.
If the electron affinity is very less then the electron gain enthalpy is high that is if electron affinity is negative electron gain enthalpy is positive and vice versa.
Since the electron affinity noble or inert gases, is very less that is largely negative; there electron gain enthalpy largely positive.
★★ HOPE THAT HELPS ☺️ ★★
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