Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Thorium> ?p ?o }
- Thorium abstract "Thorium is a chemical element with symbol Th and atomic number 90. A radioactive actinide metal, thorium is one of only two significantly radioactive elements that still occur naturally in large quantities as a primordial element (the other being uranium). It was discovered in 1828 by the Norwegian Reverend and amateur mineralogist Morten Thrane Esmark and identified by the Swedish chemist Jöns Jakob Berzelius, who named it after Thor, the Norse god of thunder.A thorium atom has 90 protons and therefore 90 electrons, of which four are valence electrons. Thorium metal is silvery and tarnishes black when exposed to air. Thorium is weakly radioactive: all its known isotopes are unstable, with the seven naturally occurring ones (thorium-227, 228, 229, 230, 231, 232, and 234) having half-lives between 25.52 hours and 14.05 billion years. Thorium-232, which has 142 neutrons, is the most stable isotope of thorium and accounts for nearly all natural thorium, with the other five natural isotopes occurring only in traces: it decays very slowly through alpha decay to radium-228, starting a decay chain named the thorium series that ends at lead-208. Thorium is estimated to be about three to four times more abundant than uranium in the Earth's crust, and is chiefly refined from monazite sands as a by-product of extracting rare earth metals.Thorium was once commonly used as the light source in gas mantles and as an alloying material, but these applications have declined due to concerns about its radioactivity. Thorium is still widely used as an alloying element in TIG welding electrodes (at a rate of 1%-2% mix with tungsten). It remains popular as a material in high-end optics and scientific instrumentation; thorium and uranium are the only significantly radioactive elements with major commercial applications that do not rely on their radioactivity. Thorium is predicted to be able to replace uranium as nuclear fuel in nuclear reactors, but only a few thorium reactors have yet been completed.".
- Thorium thumbnail Decay_Chain_Thorium.svg?width=300.
- Thorium wikiPageExternalLink inf62.html.
- Thorium wikiPageExternalLink tfacts147.html.
- Thorium wikiPageExternalLink decaybasinnatural.htm.
- Thorium wikiPageExternalLink www.ithec.org.
- Thorium wikiPageExternalLink www.itheo.org.
- Thorium wikiPageExternalLink 090.htm.
- Thorium wikiPageID "30044".
- Thorium wikiPageLength "83331".
- Thorium wikiPageOutDegree "488".
- Thorium wikiPageRevisionID "707362533".
- Thorium wikiPageWikiLink Acetylacetone.
- Thorium wikiPageWikiLink Actinide.
- Thorium wikiPageWikiLink Actinium.
- Thorium wikiPageWikiLink Age_of_the_Earth.
- Thorium wikiPageWikiLink Age_of_the_universe.
- Thorium wikiPageWikiLink Alkali_metal.
- Thorium wikiPageWikiLink Alkaline_earth_metal.
- Thorium wikiPageWikiLink Allanite.
- Thorium wikiPageWikiLink Alloy.
- Thorium wikiPageWikiLink Alpha_decay.
- Thorium wikiPageWikiLink Alpha_particle.
- Thorium wikiPageWikiLink Alvin_Radkowsky.
- Thorium wikiPageWikiLink Americium.
- Thorium wikiPageWikiLink Ammonia.
- Thorium wikiPageWikiLink Ammonium.
- Thorium wikiPageWikiLink Ampoule.
- Thorium wikiPageWikiLink Antimony.
- Thorium wikiPageWikiLink Arc_lamp.
- Thorium wikiPageWikiLink Arsenate.
- Thorium wikiPageWikiLink Arsenic.
- Thorium wikiPageWikiLink Atomic_mass.
- Thorium wikiPageWikiLink Atomic_mass_unit.
- Thorium wikiPageWikiLink Atomic_number.
- Thorium wikiPageWikiLink Atomic_orbital.
- Thorium wikiPageWikiLink Barium.
- Thorium wikiPageWikiLink Binary_compound.
- Thorium wikiPageWikiLink Bismuth.
- Thorium wikiPageWikiLink Block_(periodic_table).
- Thorium wikiPageWikiLink Blood.
- Thorium wikiPageWikiLink Boiling_point.
- Thorium wikiPageWikiLink Borate.
- Thorium wikiPageWikiLink Boride.
- Thorium wikiPageWikiLink Breeder_reactor.
- Thorium wikiPageWikiLink Bromine.
- Thorium wikiPageWikiLink Brookhaven_National_Laboratory.
- Thorium wikiPageWikiLink Caesium_chloride.
- Thorium wikiPageWikiLink Calcium_carbonate.
- Thorium wikiPageWikiLink Cancer.
- Thorium wikiPageWikiLink Carbide.
- Thorium wikiPageWikiLink Carbon.
- Thorium wikiPageWikiLink Carbon_dioxide.
- Thorium wikiPageWikiLink Carbon_group.
- Thorium wikiPageWikiLink Carbonate.
- Thorium wikiPageWikiLink Carbon–hydrogen_bond.
- Thorium wikiPageWikiLink Carboxylate.
- Thorium wikiPageWikiLink Carcinogen.
- Thorium wikiPageWikiLink Carl_Auer_von_Welsbach.
- Thorium wikiPageWikiLink Catalysis.
- Thorium wikiPageWikiLink Category:Actinides.
- Thorium wikiPageWikiLink Category:Carcinogens.
- Thorium wikiPageWikiLink Category:Chemical_elements.
- Thorium wikiPageWikiLink Category:Nuclear_fuels.
- Thorium wikiPageWikiLink Category:Nuclear_materials.
- Thorium wikiPageWikiLink Category:Thorium.
- Thorium wikiPageWikiLink Cathode.
- Thorium wikiPageWikiLink Cavity_magnetron.
- Thorium wikiPageWikiLink Ceramic.
- Thorium wikiPageWikiLink Cerium.
- Thorium wikiPageWikiLink Cerium(IV)_oxide.
- Thorium wikiPageWikiLink Chalcogen.
- Thorium wikiPageWikiLink Chemical_element.
- Thorium wikiPageWikiLink Chemical_stability.
- Thorium wikiPageWikiLink Chloride.
- Thorium wikiPageWikiLink Chromate_and_dichromate.
- Thorium wikiPageWikiLink Chromium.
- Thorium wikiPageWikiLink Cluster_decay.
- Thorium wikiPageWikiLink Colorado_School_of_Mines.
- Thorium wikiPageWikiLink Congener_(chemistry).
- Thorium wikiPageWikiLink Coordination_number.
- Thorium wikiPageWikiLink Coral.
- Thorium wikiPageWikiLink Cracking_(chemistry).
- Thorium wikiPageWikiLink Crucible.
- Thorium wikiPageWikiLink Crystal_bar_process.
- Thorium wikiPageWikiLink Crystallization.
- Thorium wikiPageWikiLink Cubic_crystal_system.
- Thorium wikiPageWikiLink Curium.
- Thorium wikiPageWikiLink Cyclopentadienyl.
- Thorium wikiPageWikiLink Decay_chain.
- Thorium wikiPageWikiLink Decay_product.
- Thorium wikiPageWikiLink Dermatitis.
- Thorium wikiPageWikiLink Developing_country.
- Thorium wikiPageWikiLink Dipotassium_cyclooctatetraenide.
- Thorium wikiPageWikiLink Dispersion_(optics).
- Thorium wikiPageWikiLink Disproportionation.
- Thorium wikiPageWikiLink Dmitri_Mendeleev.
- Thorium wikiPageWikiLink Double_beta_decay.
- Thorium wikiPageWikiLink Drawing_(manufacturing).
- Thorium wikiPageWikiLink Dry_ice.