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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).

socratic.org/questions/what-is-the-usual-oxidation-number-of-oxygen-of-hydrogen

Dec 2, 2016 ... The oxidation state of an element is a big fat 0. When these 2 elements react together, when the oxygen is "reduced" and the hydrogen is ...

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.

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

The oxidation number of an atom is zero in a neutral substance that contains atoms of only one element. Thus ... Oxygen usually has an oxidation number of -2 .

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.

www.answers.com/Q/What_is_the_usual_oxidation_number_of_an_oxygen_and_of_hydrogen

Usually the oxidation no of oxygen is -2 and the oxidation no of hydrogen is +1 in a compound.

www.quora.com/What-is-the-oxidation-number-of-oxygen-in-hydrogen-peroxide-H2O2

The oxidation number of oxygen in compounds is usually -2, but it is -1 in peroxides. The sum of the oxidation numbers of all the atoms in a neutral compound is 0.

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, ...