métal alcalincommon nounEtymologyexpandsee metal and alkaline.Definition1. Chemical element of the first column (group 1 element) of the periodic table of elements (excluding hydrogen), characterized by the presence of a single electron, easily lost. Highly reactive, these elements are never found in their elemental state in nature and react immediately in the presence of moisture, hence their storage by immersion in mineral oil.chimieexpandHyperonymsélément chimiquemétalHyponymsmasse atomiquelithiumsodiumpotassiumrubidiumcésiumfranciumTranslationsgerman:Alkalimetallenglish:alkali metalspanish:metal alcalino