Alkali metal
noun
noun ·Rare ·Advanced level
Definitions
Noun
- 1 Any of the soft, light, reactive metals of Group 1 of the periodic table; lithium, sodium, potassium, rubidium, cesium, and francium.
- 2 any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium) wordnet