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Encyclopedia > Earth (chemistry)

--203.87.197.214 01:24, 8 August 2007 (UTC)--203.87.197.214 01:24, 8 August 2007 (UTC)--203.87.197.214 01:24, 8 August 2007 (UTC)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 difficult to decompose, such as rare earths and alkaline earths. The periodic table of the chemical elements A chemical element, or element for short, is a type of atom that is defined by its atomic number; that is, by the number of protons in its nucleus. ... Chinese (Wu Xing) Japanese (Godai) Earth (地) | Water (水) | Fire (火) | Air / Wind (風) | Void / Sky / Heaven (空) Hinduism (Tattva) and Buddhism (Mahābhūta) Vayu / Pavan — Air / Wind Agni / Tejas — Fire Akasha — Aether Prithvi / Bhumi — Earth Ap / Jala — Water Bön New Zealand “The Four Elements” redirects here. ... PLATO was one of the first generalized Computer assisted instruction systems, originally built by the University of Illinois (U of I) and later taken over by Control Data Corporation (CDC), who provided the machines it ran on. ... A chemical compound is a chemical substance of two or more different chemically bonded chemical elements, with a fixed ratio determining the composition. ... A rare earth is an oxide of a rare earth element. ... This article contains information that has not been verified. ...


Actually, earths are metallic oxides, and the corresponding metals were classified into the corresponding groups: rare earth metals and alkaline earth metals. An oxide is a chemical compound containing an oxygen atom and other elements. ... Hot metal work from a blacksmith In chemistry, a metal (Greek: Metallon) is an element that readily loses electrons to form positive ions (cations) and has metallic bonds between metal atoms. ... de;Metalle der Seltenen Erden Categories: Stub | Chemical element groups ... The alkaline earth metals are the series of elements in Group 2 (IUPAC style) of the periodic table: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba) and radium (Ra) (not always considered due to its radioactivity and very short half-life). ...


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  Results from FactBites:
 
Earth (chemistry) - Wikipedia, the free encyclopedia (98 words)
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 difficult to decompose, such as rare earths and alkaline earths.
In fact, earths are metallic oxides, and the corresponding metals were clasified into the corresponding groups: rare earth metals and alkaline earth metals.
  More results at FactBites »

 
 

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