Atomic Number 21
Noun
1.
atomic number 21
- a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite
Sc
,
scandium
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.
thortveitite
- a mineral consisting of scandium yttrium silicate; a source of scandium
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