atomic oxygen
31atomic number 8 — noun a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth s crust • Syn: ↑oxygen, ↑O • Derivationally… …
32oxygen 15 — an artificial radioactive isotope of oxygen, atomic mass 15, having a half life of 2.04 minutes; it decays by positron emission (1.70 MeV) and is used as a tracer in the measurement of regional blood volume and flow and oxygen metabolism by… …
33Atomic Energy of Canada Limited — Infobox Company company name = Atomic Energy of Canada Limited company company type = Crown Corporation foundation = 1952|f location = Mississauga, Ontario key people = Hugh MacDiarmid, President and CEO industry = Nuclear products = Nuclear… …
34atomic mass unit — Physics. 1. Also called dalton. a unit of mass, equal to 1/12 the mass of the carbon 12 atom and used to express the mass of atomic and subatomic particles. 2. (formerly) a unit of mass, equal to 1/16 the mass of an oxygen atom having atomic mass …
35oxygen burning — noun the nucleosynthesis process, subsequent to carbon burning, in which neon disintegrates to oxygen which subsequently fuses to form silicon, phosphorus sulfur and other elements of atomic number up to …
36oxygen — noun the chemical element of atomic number 8, a colourless, odourless reactive gas that forms about 20 per cent of the earth s atmosphere and is essential to plant and animal life. (Symbol: O) Derivatives oxygenic adjective oxygenous adjective… …
37atomic number 14 — noun a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth s crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors • Syn: ↑silicon, ↑Si • Hypernyms:… …
38atomic number 26 — noun a heavy ductile magnetic metallic element; is silver white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood • Syn: ↑iron, ↑Fe • Hypernyms: ↑metallic element,… …
39Allotropes of oxygen — Contents 1 Atomic oxygen 2 Dioxygen 3 Singlet oxygen 4 Ozone …
40Ozone-oxygen cycle — in the ozone layer. The ozone oxygen cycle is the process by which ozone is continually regenerated in Earth s stratosphere, all the while converting ultraviolet radiation into heat. In 1930 Sydney Chapman resolved the chemistry involved. The… …
