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- Name : Scandium
- Symbol : Sc
- Atomic # : 21
- Atom weight: 44.9559
- Melting P. : 1541
- Boiling P. : 2836
- Oxidation : +3
- Pronounced : SKAN-di-em
- From : Latin Scandia, Scandinavia
- Identified : Predicted by Mendeleyev in 1871
- Appearance : Fairly soft, silvery-white metal
- Note : Because of its light weight, 99% of scandium is used by the
- U.S. Air Force
-
- [Properties]
-
- Scandium is a very lightweight, silvery white metal that is fairly soft.
- It tarnishes slightly in air, taking on a yellow-pink hue. Scandium heads
- up Group IIIB on the periodic table of the elements; more importantly, it
- heads the list of 17 elements known as the rare-earth elements. (This name
- for the group is no longer appropriate because most of them are available
- in far greater quantities than originally supposed. Tradition prevails,
- however!) Other rare earths belong to the lantranide series of elements,
- atomic numbers 57 through 71.
- The rare-earth elements are all metals. They are all sufficiently
- reactive that none exists in nature as the elemental metal. With the
- notable exception of Scandium, rare-earth ores are found in mixtures of
- four, five, or more. The rare earths are so similar that the processes for
- separating them were not well developed until recently.
-