scandium

scandium
    n 1: a white trivalent metallic element; sometimes classified in
         the rare earth group; occurs in the Scandinavian mineral
         thortveitite [syn: {scandium}, {Sc}, {atomic number 21}]
    

Scandium \Scan"di*um\, n. [NL. So called because found in
   Scandinavian minerals.] (Chem.)
   A rare metallic element of the boron group, whose existence
   was predicted under the provisional name {ekaboron} by means
   of the periodic law, and subsequently discovered by spectrum
   analysis in certain rare Scandinavian minerals (euxenite and
   gadolinite). It has not yet been isolated. Symbol Sc. Atomic
   weight 44.
   [1913 Webster]
    

Ekabor \Ek"a*bor`\ ([e^]k"[.a]*b[=o]r`), Ekaboron \Ek"a*bo"ron\
   (-b[=o]"r[o^]n), n. [G., fr. Skr. [=e]ka one + G. bor, boron,
   E. boron.] (Chem.)
   The name given by Mendelejeff in accordance with the periodic
   law, and by prediction, to a hypothetical element then
   unknown, but since discovered and named {scandium}; -- so
   called because it was a missing analogue of the boron group.
   See {Scandium}.
   [1913 Webster]
    

scandium
Symbol: Sc
Atomic number: 21
Atomic weight: 44.956
Rare soft silvery metallic element belonging to group 3 of the periodic
table. There are ten isotopes, nine of which are radioactive and have
short half-lives. Predicted in 1869 by Mendeleev, isolated by Nilson in
1879.