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en.wikipedia.org/wiki/Oxidation_state

The oxidation state, often called the oxidation number, is an indicator of the degree of oxidation .... Oxygen is assumed to have its usual oxidation state of −2, and so the sum of the oxidation states of all the atoms can be expressed as x + 2( −2) ...

en.wikipedia.org/wiki/List_of_oxidation_states_of_the_elements

This is a list of known oxidation states of the chemical elements, excluding nonintegral values. ...... "Oxygen Compounds of Nonmetallic Elements". General  ...

www.chemguide.co.uk/inorganic/redox/oxidnstates.html

element, usual oxidation state, exceptions. Group 1 metals, always +1. Group 2 metals, always +2. Oxygen, usually -2, except in peroxides and F2O (see below).

chemed.chem.purdue.edu/genchem/topicreview/bp/ch2/oxnumb.html

By definition, the oxidation number of an atom is the charge that atom would have if the compound was ... Oxygen usually has an oxidation number of -2.

www.thoughtco.com/rules-for-assigning-oxidation-numbers-607567

Mar 4, 2017 ... Learn how to assign oxidation numbers to keep track of the distribution of electrons during a chemical reaction. ... The usual oxidation number of hydrogen is +1. ... The oxidation number of oxygen in compounds is usually -2.

www.dummies.com/education/science/chemistry/rules-for-assigning-oxidation-numbers-to-elements

Rule 5: The oxidation number of oxygen in a compound is usually –2. If, however, the oxygen is in a class of compounds called peroxides (for example, ...

www.science.uwaterloo.ca/~cchieh/cact/c123/oxidstat.html

Assign an oxidation state (or oxidation number) to an atom in a molecule or ion. ... The oxidation state of oxygen in its compounds is -2, except for peroxides like H2O2, and .... This is the normal oxidation state of group VA: N, P, As, Sb, Bi.

chemistry.stackexchange.com/questions/15579/oxidation-state-of-oxygen-in-hof

Aug 24, 2014 ... Unfortunately the concept of oxidation states is not as well defined as one would expect. We have to thank the IUPAC for that. Have a look at ...

study.com/academy/lesson/oxidation-number-definition-rules-examples.html

An oxidation number is assigned to an atom to know its... ... Br, I), the usual oxidation number is -1, except when they are combined with oxygen or fluorine.