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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 .... 2. 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 +  ...

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

Peroxides include hydrogen peroxide, H2O2. This is an electrically neutral compound and so the sum of the oxidation states of the hydrogen and oxygen must ...

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

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

www.periodni.com/oxidation_numbers_calculator.php

To calculate oxidation numbers of elements in the chemical compound, enter ... Oxygen almost always has an oxidation number of -2, except in H2O2 (when it is  ...

www.khanacademy.org/science/chemistry/oxidation-reduction/redox-oxidation-reduction/v/practice-determining-oxidation-states

Determining oxidation numbers in magnesium oxide and magnesium ... My Chemistry teacher taught us to assume that Oxygen is 2-, and Hydrogen is 1+.

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 ...

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

Above it says, "oxygen is usually assigned a −2 oxidation number (except in peroxide compounds where it is −1, and in binary compounds with fluorine where it ...

socratic.org/questions/what-is-the-oxidation-number-of-oxygen-in-co2

Oct 23, 2015 ... Oxygen takes its standard oxidation state of −II ; C therefore takes its ... oxidation states of C in elemental C , CO , and carbon suboxide, C3O2 ?

chemistry.stackexchange.com/questions/66262/why-does-oxygen-in-oh-have-an-oxidation-state-of-2

You should be getting three lone pairs on oxygen and one O−H bond. ... The two extraneous electrons give an oxidation state of −II. Likewise, hydrogen has lost ...