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13 May, 09:23

Which of the following gases is monatomic at STP?

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  1. 13 May, 11:49
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    The only chemical elements which are stable single atom molecules at standard temperature and pressure (STP) are the noble gases. These are helium, neon, argon, krypton, xenon and radon. The heavier noble gases can form chemical compounds, but the lighter ones are non-reactive or inert.
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