(A) Argon $(Ar)$ is a noble gas belonging to Group $18$. Noble gases exist as monoatomic gases because they have a stable valence shell configuration

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(A) Argon $(Ar)$ is a noble gas belonging to Group $18$. Noble gases exist as monoatomic gases because they have a stable valence shell configuration $(ns^2 np^6)$. Oxygen $(O_2)$,Nitrogen $(N_2)$,and Bromine $(Br_2)$ exist as diatomic molecules in their standard states.