alkaline-earth element
11earth — /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… …
12transuranium element — Any of the chemical elements after uranium in the periodic table (with atomic numbers greater than 92). All are radioactive (see radioactivity), with half lives ranging from tens of millions of years to fractions of a millisecond. Only two,… …
13Element — El e*ment, n. [F. [ e]l[ e]ment, L. elementum.] 1. One of the simplest or essential parts or principles of which anything consists, or upon which the constitution or fundamental powers of anything are based. [1913 Webster] 2. One of the ultimate …
14Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …
15earth — 1. Soil; the soft material of the land, as opposed to rock and sand. 2. An easily pulverized mineral. 3. An insoluble oxide of aluminum or of certain other elements characterized by a high melting point. [A.S. eorthe] alkaline earths alkaline e.… …
16Chemical element — The periodic table of the chemical elements A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus.[1] Familiar examples of …
17Mercury (element) — gold ← mercury → thallium Cd ↑ Hg ↓ Cn …
18Rare-earth mineral — A rare earth mineral is a mineral whose principal element is a rare earth element. Yttrium is found in almost all rare earth minerals. Rare earth minerals are usually found in association with alkaline to per alkaline igneous complexes, in… …
19metallic element — noun any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. • Syn: ↑metal • Derivationally related forms: ↑metallic (for: ↑metal), ↑metal (for: ↑ …
20Group 7 element — Group → 7 ↓ Period 4 25 Mn 5 …
