noun Chemistry.
a rare, trivalent, metallic element obtained from thortveitite. Symbol: Sc; atomic weight: 44.956; atomic number: 21; specific gravity: 3.0.

1875–80; < Neo-Latin; see Scandia, -ium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
scandium (ˈskændɪəm)
a rare light silvery-white metallic element occurring in minute quantities in numerous minerals. Symbol: Sc; atomic no: 21; atomic wt: 44.955910; valency: 3; relative density: 2.989; melting pt: 1541°C; boiling pt: 2836°C
[C19: from New Latin, from Latin Scandia Scandinavia, where it was discovered]

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American Heritage
Medical Dictionary

scandium scan·di·um (skān'dē-əm)
Symbol Sc
A highly reactive metallic element found in various rare minerals and separated as a byproduct in the processing of certain uranium ores. Atomic number 21; atomic weight 44.956; melting point 1,541°C; boiling point 2,830°C; specific gravity 2.99; valence 3.

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American Heritage
Science Dictionary
scandium   (skān'dē-əm)  Pronunciation Key 
Symbol Sc
A soft, silvery, very lightweight metallic element that is found in various rare minerals and is a byproduct in the processing of certain uranium ores. It has a high melting point and is used to make high-intensity lights. Atomic number 21; atomic weight 44.956; melting point 1,540°C; boiling point 2,850°C; specific gravity 2.99; valence 3. See Periodic Table.
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Encyclopedia Britannica


((Sc), chemical element, rare-earth metal of transition Group IIIb of the periodic table. Scandium is a silvery-white, rather soft metal. After Dmitry Ivanovich Mendeleyev predicted (1871) its existence, tentatively calling it ekaboron, Lars Fredrik Nilson discovered (1879) its oxide, scandia, in the rare-earth minerals gadolinite and euxenite, and Per Teodor Cleve (later in 1879) identified scandium with the hypothetical ekaboron.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
He also predicted with equal precision the existence of scandium and germanium, and these too were soon discovered.
The anode contains, in addition to nickel oxide, a small amount of the rare element scandium.
Recently, some researchers have included two other elements-scandium and yttrium-in their discussion of rare earths.
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