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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) ...

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

Explains what oxidation states (oxidation numbers) are, and how to calculate them and make use of them. ... Remember that fluorine is the most electronegative element with oxygen second. ... element, usual oxidation state, exceptions.

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.

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.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.

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

There are 70-80% of the source saying that it's oxidation state is 0 while the rest ... brought forth in the Note are (1) assign hydrogen +1, oxygen -2, and fluorine + 1 ... The usual rules for assigning oxidation states are useless.

www.britannica.com/science/oxidation-number

The iron ion Fe 3+, for example, has an oxidation number of +3 because it can acquire three electrons to form a chemical bond, while the oxygen ion O 2− has ...

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, ...

chem.libretexts.org/Core/Analytical_Chemistry/Electrochemistry/Redox_Chemistry/Oxidation_States_(Oxidation_Numbers)

Jan 26, 2014 ... Element, Usual oxidation state, Exceptions. Group 1 metals, Always +1. Group 2 metals, Always +2. Oxygen, Usually -2, Peroxides and F2O ...

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.