atomic oxygen
21oxygen — A colorless, odorless, tasteless, non explosive gas, it is the most abundant element on earth, constituting about half of the surface material. It makes up about 9/10 of water, two thirds of the human body, and 1/5 (by volume) of air. Normal… …
22Atomic ratio — The atomic ratio is a measure of the ratio of atoms of one kind (i) to another kind (j). A closely related concept is the atomic percent (or at.%), which gives the percentage of one kind of atom relative to the total number of atoms. The… …
23atomic physics — Scientific study of the structure of the atom, its energy states, and its interaction with other particles and fields. The modern understanding of the atom is that it consists of a heavy nucleus of positive charge surrounded by a cloud of light,… …
24oxygen — /ˈɒksədʒən / (say oksuhjuhn) noun 1. a colourless, odourless gaseous element, constituting about one fifth of the volume of the atmosphere and present in a combined state throughout nature. It is the supporter of combustion in air and is vital… …
25Atomic radii of the elements (data page) — << Chemical elements data references Contents 1 Atomic radii 2 Notes 3 References 3.1 Atomic radius (empirical) …
26Atomic carbon — This very short lived species is created by passing a large current through two adjacent carbon rods, generating an electric arc. Atomic carbon is generated in the process. Professor Phil Shevlin has done the principal work in the field based at… …
27Atomic and molecular astrophysics — Within a few million years the light from bright stars will have boiled away this molecular cloud of gas and dust. The cloud has broken off from the Carina Nebula. Newly formed stars are visible nearby, their images reddened by blue light being… …
28atomic mass — Chem. the mass of an isotope of an element measured in units formerly based on the mass of one hydrogen atom taken as a unit or on 1/16 the mass of one oxygen atom, but after 1961 based on 1/12 the mass of the carbon 12 atom. Abbr.: at. m. [1895… …
29atomic — a. of atoms. ♦ atom bomb, ♦ atomic bomb, bomb of which the immense destructive power is due to sudden release of energy by nuclear fission. ♦ atomic number, number representing the magnitude of the positive charge on the nucleus of an… …
30oxygen — noun /ɒksɪʤən̩/ a) A chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994. b) Molecular oxygen (O), a colorless, odorless gas at room temperature. Syn: E948 …
