(A) Noble gases have a stable electronic configuration with completely filled valence shells ($ns^2 np^6$ for all except Helium which is $1s^2$).This

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They have completely paired up and stable electron shells

(A) Noble gases have a stable electronic configuration with completely filled valence shells ($ns^2 np^6$ for all except Helium which is $1s^2$).This stable configuration leads to high ionization enthalpy and low electron gain enthalpy,making them chemically inert under normal conditions.