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(B) Noble gases (Group $18$ elements) have completely filled valence shells ($ns^2 np^6$ configuration,except $He$ which is $1s^2$).Due to their stabl

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low chemical reactivity

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(B) Noble gases (Group $18$ elements) have completely filled valence shells ($ns^2 np^6$ configuration,except $He$ which is $1s^2$).Due to their stable electronic configuration,they have very high ionization enthalpy and zero electron gain enthalpy.Consequently,they show very low chemical reactivity under normal conditions.

Noble gases are the group of elements which show very .......

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