Category:cy:Alkali metals

Welsh terms for alkali metals, chemical elements in group 1 of the periodic table, which all have one valence electron.

NOTE: This is a set category. It should contain terms for alkali metals, not merely terms related to alkali metals. It may contain more general terms (e.g. types of alkali metals) or more specific terms (e.g. names of specific alkali metals), although there may be related categories specifically for these types of terms.