A loss of electrons is called OXIDATION
A gain of electrons is called REDUCTION
When there is a loss and a gain of electrons, this is called a REDOX reaction
An oxidising agent accepts electrons and gets reduced
A reducing agent donates electrons and gets oxidised
Oxidation State Rules -
- All atoms are treated as ions, even if they are covalently bonded
- Uncombined elements have an oxidation states of 0 (this applies to diatomic elements, like oxygen, hydrogen, fluorine etc.)
- In compounds, the overall oxidation state is equal to the charge
- The oxidation state of a mono atomic ion is the same as the charge
- Combined oxygen is nearly always -2
- Combined hydrogen is +1
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