Astrophysics (index)about

oxidation state

(oxidation number)
(number characterizing atoms of a compound as ions)

A compound's oxidation state (or oxidation number) is a small integer indicating the degree of oxidation of an atom in a compound, i.e., the number of electrons one atom would have "borrowed" from the other, if they were a pair of ions each with filled shells, one positive, the other negative. Such a bond is called an ionic bond, but in actuality, bonds are only ionic to a degree, always acting at least in part as if the electrons are shared, i.e., in part, a covalent bond.


(chemistry)
http://en.wikipedia.org/wiki/Oxidation_state
https://www.khanacademy.org/science/chemistry/chemical-reactions-stoichiome/types-of-chemical-reactions/a/oxidation-number
http://www.science.uwaterloo.ca/~cchieh/cact/c123/oxidstat.html

Referenced by:
atmosphere formation
biosignature
reducing atmosphere

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