oxidation number

oxidation number
a number assigned to each atom in a molecule or ion that represents the number of electrons theoretically gained (positive oxidation numbers) or lost (negative numbers) in converting the atom to the elemental form. Oxidation numbers are assigned according to the following rules. The oxidation number of atoms in an elemental form is zero, and the oxidation number of a monatomic ion equals the ionic charge. Group I and Group II metals always have oxidation numbers of +1 and +2, respectively. Fluorine always has an oxidation number of −1; oxygen always of −2, except in peroxides and superoxides (where it is −1) and in compounds containing OF bonds. Hydrogen always has an oxidation number of +1, except in metal hydrides (where it is −1). Oxidation numbers are assigned to other atoms so that the sum for all atoms in a neutral compound equals zero and the sum for all atoms in a polyatomic ion equals the ionic charge. Called also oxidation state.

Medical dictionary. 2011.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Oxidation number — Not to be confused with oxidation state. Oxidation numbers of carbon and hydrogen in ethane In coordination chemistry, the oxidation number of a central atom in a coordination compound is the charge that it would have if all the ligands were… …   Wikipedia

  • oxidation number — ▪ chemistry also called  Oxidation State,        the total number of electrons (electron) that an atom either gains or loses in order to form a chemical bond (chemical bonding) with another atom.       Each atom that participates in an oxidation… …   Universalium

  • oxidation number — noun the degree of oxidation of an atom or ion or molecule; for simple atoms or ions the oxidation number is equal to the ionic charge the oxidation number of hydrogen is +1 and of oxygen is 2 • Syn: ↑oxidation state • Hypernyms: ↑number …   Useful english dictionary

  • oxidation number — oksidacijos laipsnis statusas T sritis chemija apibrėžtis Sąlyginis atomo krūvis junginyje, kurį atomas įgytų netekdamas (prisijungdamas) valentinių elektronų. atitikmenys: angl. oxidation degree; oxidation number; valence number rus. степень… …   Chemijos terminų aiškinamasis žodynas

  • oxidation number — (also oxidation state) noun Chemistry a number representing the number of electrons lost or gained by an atom of a particular element when chemically combined …   English new terms dictionary

  • oxidation number — noun see oxidation state …   New Collegiate Dictionary

  • oxidation number — /ɒksəˈdeɪʃən nʌmbə/ (say oksuh dayshuhn numbuh) noun a number representing the electric charges that the atom would have if the electrons in a compound were assigned to the atoms in a conventional way, as FeCl3, where the ferric ion has three… …  

  • oxidation number — noun the net sum of the negative, less the positive, charges on an atom …   Wiktionary

  • Oxidation state — Not to be confused with Oxidation number. In chemistry, the oxidation state is an indicator of the degree of oxidation of an atom in a chemical compound. The formal oxidation state is the hypothetical charge that an atom would have if all bonds… …   Wikipedia

  • oxidation–reduction reaction — ▪ chemical reaction Introduction also called  redox reaction        any chemical reaction in which the oxidation number of a participating chemical species changes. The term covers a large and diverse body of processes. Many oxidation– reduction… …   Universalium

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”