separating+element

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• 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

• chemical element — Introduction also called  element,         any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.       This article considers the… …   Universalium

• Rare earth element — Rare earth ore, shown with a United States penny for size comparison These rare …   Wikipedia

• Mercury (element) — gold ← mercury → thallium Cd ↑ Hg ↓ Cn …   Wikipedia

• transuranium 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,… …   Universalium

• nitrogen group element — ▪ chemical elements Introduction  any of the chemical elements that constitute Group Va of the periodic table (see Figure >). The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi). The elements share… …   Universalium

• Air (classical element) — In traditional cultures, air is often seen as a universal power or pure substance. Its fundamental importance to life can be seen in words such as spirit, inspire, expire, and aspire, all derived from the Latin spirare ( to breathe ). Greek and… …   Wikipedia

• Binaural recording — is a method of recording audio which uses a special microphone arrangement intended for replay using headphones. Dummy head recording refers to a specific method of capturing the audio, generally using a bust including pinnae (outer ears). As one …   Wikipedia

• Helikon vortex separation process — The Helikon vortex separation process is an aerodynamic uranium enrichment process designed around a device called a vortex tube. This method was designed and used in South Africa for producing reactor fuel with a uranium 235 content of around… …   Wikipedia

• List of Edison patents — Below is a list of Edison patents. Thomas Edison was an inventor who, it is said, accumulated 1500 plus patents worldwide for his inventions. Nearly 1100 of Edison s patents were in the United States, but other patents were approved in countries… …   Wikipedia

• Empedocles — M.R.Wright INTRODUCTION Empedocles was a native of Acragas (Agrigento) in Sicily, a Doric colony founded on the south coast of the island in the sixth century BC, which soon grew to rival Syracuse in its prosperity. A line of temples, many of… …   History of philosophy