scandium group

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• Scandium — (pronEng|ˈskændiəm) is a chemical element that has the symbol Sc and atomic number 21. A silvery white metal that is always present as compounds, scandium ores occur as rare minerals from Scandinavia and elsewhere, and it is sometimes considered… …   Wikipedia

• Group 3 element — || Group 3/ungrouped | 7 || **ActinidesThe Group 3 elements are chemical elements comprising the third vertical column of the periodic table. IUPAC has not recommended a specific format for the periodic table, so different conventions are… …   Wikipedia

• 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… …   The Collaborative International Dictionary of English

• 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,… …   Elements of periodic system

• scandium — /skan dee euhm/, n. Chem. a rare, trivalent, metallic element obtained from thortveitite. Symbol: Sc; at. wt.: 44.956; at. no.: 21; sp. gr.: 3.0. [1875 80; < NL; see SCANDIA, IUM] * * * ▪ chemical element  (Sc), chemical element, rare earth metal …   Universalium

• scandium — 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… …   The Collaborative International Dictionary of English

• Group (periodic table) — The periodic table of the chemical elements. The columns represent the groups In chemistry, a group (also known as a family) is a vertical column in the periodic table of the chemical elements. There are 18 groups in the standard periodic table,… …   Wikipedia

• Group III — In the periodic table Group III covered what are now called *Group 13 elements: boron (B), aluminium (Al), gallium (Ga), indium (In), thallium (Tl) *Group 3 elements: scandium (Sc) and yttrium (Y) plus the Lanthanide and Actinide series elements …   Wikipedia

• rare-earth element — /rair errth /, Chem. any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. Also called rare earth metal. [1955 …   Universalium

• ekaboron — 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 …   The Collaborative International Dictionary of English

• Crystal structure of boron-rich metal borides — Two single crystals of YB66 (1 cm diameter) grown by floating zone technique using (100) oriented seeds. In the top crystal, the seed (left from the black line) has same diameter as the crystal. In the bottom crystal (sliced), the seed is much… …   Wikipedia