alkaline-earth element

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• Alkaline earth metal — Group 2 Period  2 4 Be 3 …   Wikipedia

• alkaline-earth metal — /al keuh luyn errth , lin /, Chem. any of the group of bivalent metals including barium, radium, strontium, calcium, and, usually, magnesium, the hydroxides of which are alkalis but less soluble than those of the alkali metals. [1900 05] * * * ▪… …   Universalium

• alkaline-earth metal — noun any of the bivalent metals of group II of the periodic table (calcium or strontium or barium or magnesium or beryllium) • Syn: ↑alkaline earth • Hypernyms: ↑metallic element, ↑metal * * * noun : any of the metals of group II of the periodic… …   Useful english dictionary

• alkaline earth — noun any of the bivalent metals of group II of the periodic table (calcium or strontium or barium or magnesium or beryllium) • Syn: ↑alkaline earth metal • Hypernyms: ↑metallic element, ↑metal …   Useful english dictionary

• 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

• Rare earth element — Rare earth ore, shown with a United States penny for size comparison These rare …   Wikipedia

• earth — [ʉrth] n. [ME erthe < OE eorthe, akin to Ger erde < IE base * er > Gr era, earth, Welsh erw, field] 1. [often E ] the planet that we live on; terrestrial globe: it is the fifth largest planet of the solar system and the third in distance …   English World dictionary

• earth — /errth/, n. 1. (often cap.) the planet third in order from the sun, having an equatorial diameter of 7926 mi. (12,755 km) and a polar diameter of 7900 mi. (12,714 km), a mean distance from the sun of 92.9 million mi. (149.6 million km), and a… …   Universalium

• Earth (chemistry) — The chemical term earths was historically applied to certain chemical substances, once thought to be elements, and this name was borrowed from one of the four classical elements of Plato. Earths later turned out to be chemical compounds, albeit… …   Wikipedia

• element — 1. A substance composed of atoms of only one kind, i.e., of identical atomic (proton) number, that therefore cannot be decomposed into two or more elements and that can lose its chemical properties only by union with some other e. or by a nuclear …   Medical dictionary

• earth — /ɜθ / (say erth) noun 1. (often upper case) the planet which we inhabit, the third in order from the sun. Its period of revolution is 1 year, and its mean distance from the sun 149 597 870 km. Its diameter is 12 756 km. It has one satellite, the… …