Monatomic

In physics and chemistry, monatomic is a combination of the words "mono" and "atomic," and means "single atom." It is usually applied to gases: a monatomic gas is one in which atoms are not bound to each other.

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Under Standard Temperature and Pressure (STP), all of the noble gases are monatomic. To be a monatomic gas, an element usually has to have zero valence (as for the noble gases); or be a normally diatomic gas under extremely low pressure, as is the case with oxygen in Earth's upper atmosphere.

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Physics: Physics (from the Greek, φυσικός (phusikos), "natural", and φύσις (phusis), "nature") is the science of the natural world in the broadest sense, dealing with matter and energy and the fundamental forces of nature that govern the interaction...

Chemistry: Chemistry (in Greek: χημεία) is the science of matter that deals with the composition, structure, and properties of substances and with the transformations that they undergo. In the study of matter, chemistry also investigates its interactions with energy and itself (se...

Gas: :For other meanings see gas (disambiguation)....