atom fraction
1fraction — [ fraksjɔ̃ ] n. f. • 1187; « rupture » v. 1400; bas lat. fractio, de frangere « briser » I ♦ Liturg. La fraction du pain : action de rompre le pain eucharistique avant de communier. II ♦ 1 ♦ (1538) Math. Nombre rationnel, élément de l ensemble Q …
2Atom — • Primarily, the smallest particle of matter which can exist Catholic Encyclopedia. Kevin Knight. 2006. Atom Atom † …
3atom — /at euhm/, n. 1. Physics. a. the smallest component of an element having the chemical properties of the element, consisting of a nucleus containing combinations of neutrons and protons and one or more electrons bound to the nucleus by electrical… …
4atom — noun 1) they build tiny circuits atom by atom Syn: particle, molecule, bit, piece, fragment, fraction 2) there wasn t an atom of truth in the allegations Syn: grain, iota, jot, whit, mite …
5Unit fraction — A unit fraction is a rational number written as a fraction where the numerator is one and the denominator is a positive integer. A unit fraction is therefore the reciprocal of a positive integer, 1/ n . Examples are 1/1, 1/2, 1/3, 1/42 etc.… …
6Abundance of the chemical elements — Estimated proportions of matter, dark matter and dark energy in the universe. Only the fraction of the mass and energy in the universe labeled atoms is composed of chemical elements. The abundance of a chemical element measures how relatively… …
7Isotopes of hydrogen — Hydrogen (H) (Standard atomic mass: 1.00794(7) u) has three naturally occurring isotopes, denoted 1H, 2H, and 3H. Other, highly unstable nuclei (4H to 7H) have been synthesized in the laboratory but not observed in nature.Gurov YB, Aleshkin DV,… …
8Heavy water — Not to be confused with hard water or tritiated water. Deuterium oxide IUPAC name …
9Crust (geology) — Geologic provinces of the world (USGS)   Shield …
10Goldschmidt classification — The Goldschmidt classification, developed by Victor Goldschmidt, is a geochemical classification which groups the chemical elements according to their preferred host phases into lithophile (rock loving), siderophile (iron loving), chalcophile… …
