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Reference.org
Atomic ratio
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<p>The atomic ratio is a measure of the <a href="/facts/Ratio/mFmhQt7T">ratio</a> of atoms of one kind (i) to another kind (j). A closely related concept is the atomic percent (or at.%), which gives the percentage of one kind of atom relative to the total number of atoms. The <a href="/facts/Molecule/N9ljSfFq">molecular</a> equivalents of these concepts are the molar fraction, or <a href="/facts/Molar_percent/rT4aRoNm">molar percent</a>. </p>