Question

why are the noble gases monoatomic?

Answer 1

Noble gases. The only chemical elements that are stable single atom molecules at standard temperature and pressure are the noble gases.

These are helium, neon, argon, krypton, xenon and radon. Noble gases have a full outer valence shell making them rather non-reactive species.

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Answer 2

Noble gases . the only chemical elements that are stable single atom molecules at standerd temperature and pressure and pressure are the noble gases . These are helium, neon ,argon , krypton , xenon , and radon.