atomic number 3
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|Noun||1.||atomic number 3 - a soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals|
metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
amblygonite - a white or grey mineral consisting of lithium aluminum phosphate; a source of lithium
lepidolite - a mineral of the mica group; an important source of lithium
spodumene - a pyroxene mineral consisting of lithium aluminum silicate; a source of lithium
zinnwaldite - a mica containing iron and lithium