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• Tantalum(V) chloride — Chembox new Name = Tantalum(V) chloride Systematic name Tantalum(V) chloride Tantalum pentachloride Section1 = Chembox Identifiers CASNo = 7721 01 9 EINECS = ? RTECS = Section2 = Chembox Properties Formula = TaCl5 MolarMass = 358.21 g/mol Solvent …   Wikipedia

• tantalum — /tan tl euhm/, n. Chem. a gray, hard, rare, metallic element occurring in columbite and tantalite and usually associated with niobium: used, because of its resistance to corrosion by most acids, for chemical, dental, and surgical instruments and… …   Universalium

• Nuclear isomer — A nuclear isomer is a metastable state of an atomic nucleus caused by the excitation of one or more of its nucleons (protons or neutrons). Metastable refers to the fact that these excited states have half lives more than 100 to 1000 times the… …   Wikipedia

• Niobium — zirconium ← niobium → molybdenum V ↑ Nb ↓ Ta …   Wikipedia

• 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

• Protactinium — thorium ← protactinium → uranium Pr ↑ Pa ↓ …   Wikipedia

• Refractory metals — are a class of metals that are extraordinarily resistant to heat and wear. Refractory metals are said to be poorly resistant to oxidation and corrosion. [UFL EMA 6625: Advanced Metal Processing, Summer 2008, Lecture 09] These properties make them …   Wikipedia

• Capacitor — This article is about the electronic component. For the physical phenomenon, see capacitance. For an overview of various kinds of capacitors, see types of capacitor. Capacitor Modern capacitors, by a cm ruler Type Passive …   Wikipedia

• Coltan — is the industrial name for columbite–tantalite, a dull black metallic mineral from which the elements niobium (formerly columbium ) and tantalum are extracted. The niobium dominant mineral is columbite, hence the col half of the term. The mineral …   Wikipedia

• Mining industry of the Democratic Republic of the Congo — The Democratic Republic of the Congo (abbreviated DR Congo or DRC), previously known as Zaire, is immensely rich in natural resources. However, mining activities have been closely linked to serious problems in the DRC. In September 2010, the… …   Wikipedia

• Stable isotope — Graph of isotopes/nuclides by type of decay. Orange and blue nuclides are unstable, with the black squares between these regions representing stable nuclides. The unbroken line passing below many of the nuclides represents the theoretical… …   Wikipedia