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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

The less electronegative one is given a positive oxidation state. Remember that fluorine is the most electronegative element with oxygen second.

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

The oxidation number of simple ions is equal to the charge on the ion. The oxidation ... Oxygen usually has an oxidation number of -2. Exceptions include ...

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

The oxidation state of oxygen in its compounds is -2, except for peroxides like ... - 1 for halogens except when they form compounds with oxygen or one another;.

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.khanacademy.org/science/chemistry/chemical-reactions-stoichiome/types-of-chemical-reactions/a/oxidation-number

3, point, spaceIn compounds: fluorine is assigned a oxidation number; oxygen is usually assigned a oxidation number (except in peroxide compounds where it ...

www.quora.com/What-is-the-oxidation-number-of-oxygen-How-do-you-know-which-oxidation-number-of-oxygen-should-be-used

The oxidation number of oxygen atom is zero because it has not gained ant electron and so the number of protons is equal to tat of electrons.

www.periodni.com/oxidation_numbers_calculator.php

The alkali metals (group I) always have an oxidation number of +1. The alkaline earth metals (group II) are always assigned an oxidation number of +2. Oxygen ...

chemistry.stackexchange.com/questions/19319/what-is-the-oxidation-number-of-the-oxygen-in-bao2

According to the book for a binary compound, first we assign the ... "oxygen always -2 except in peroxides". This exception is in effect here, ...

chemistry.stackexchange.com/questions/73445/what-is-the-oxidation-state-of-the-element-oxygen-in-the-molecule-fons-assuming

Note: Since this is a homework question, I will not give a complete answer to this question (Site Policy). I will assume that the molecule is: enter image ...