Relative atomic mass

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The atomic nummer o hydrogen is 1. The staundart atomic wicht o hydrogen is 1.008 (this value is nae gien here as an expectation interval, as it is in elements ablo). Atomic wicht is the same as relative atomic mass. The atomic wichts o samples o hydrogen will vary accordin tae thair content o hivy hydrogen (deuterium), an this will in turn depend upon whaur the samples are collectit.

Relative atomic mass (symbol: Ar) is a dimensionless pheesical quantity, the ratio o the average mass o atoms o an element (frae a single gien sample or soorce) tae 112 of the mass of an atom of carbon-12 (known as the unified atomic mass unit).[1][2]

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