thorium (thôrˈēəm) [from Thor], radioactive chemical element; symbol Th; at. no. 90; mass number of most stable isotope 232; m.p. about 1,750℃; b.p. about 4,790℃; sp. gr. 11.7 at 20℃; valence +4. Thorium is a soft, ductile, lustrous, silver-white, radioactive...
Thorium (pronounced /ˈθɔəriəm/ THOHR-ee-əm) is a chemical element with the symbol Th and atomic number 90. Thorium is a naturally occurring, slightly radioactive metal. It is estimated to be about three to four times more abundant than uranium in the Earth's crust. It h...
(Elements & Compounds) a soft ductile silvery-white metallic element. It is radioactive and occurs in thorite and monazite: used in gas mantles, magnesium alloys, electronic equipment, and as a nuclear power source. Symbol: Th; atomic no: 90; atomic wt: 232.0381; half-life of most stable...
Thorium, radioactive metallic chemical element, chemical symbol Th, atomic number 90, one of the actinoid series of elements.
Thorium• Actinide Rare Earth Symbol:Th Date of Discovery:1828 Name Origin:ScandinavianThor Appearance:silvery Discoverer:Jons Berzelius Obtained From:monazite, thorite Melting Point:2023 K Boiling Point:5063 K Density[kg/m3]:11724 Molar Volume:19.80 × 10-6 m3/mol ...
Provides comprehensive data for each element of the periodic table of elements including up to 40 properties, names in 10 languages and common chemical compounds. Information also provided for 3,600 nuclides and 4,400 nuclide decay modes.
Uranium is a heavy, radioactive metal, the 92nd element in the periodic table, and a member of the actinide series. Its name and chemical symbol U are derived from the planet Uranus, discovered (1781) a few years before the element. A compound of uranium (uranium oxide) was discovered ...
Uranium and Thoriumdoi:10.1002/0471435139.tox042UraniumUranium compoundsThoriumThorium compoundsRadonOxidesNuclear fuel technologyTissuesSmokingMinersUranium is a heavy, radioactive metal, the 92nd element in the periodic table, and a member of the actinide series. Its name and chemical symbol U are ...
Uranium is a chemical element with the symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Uranium is weakly radioactive because all isotopes of uranium ...
DefinitionA toxic radioactive element of the actinoid series that is a soft ductile silvery metal. It has several long-lived radioisotopes found in a variety of minerals including monazite. Thorium is used in magnesium alloys, incandescent gas mantles, and nuclear fuel elements. Symbol: Th; m....