Glossary

**Oxidation**: Any one of the following changes in a chemical reaction is oxidation - (1) gain of oxygen; (2) loss of hydrogen; (3) loss of electrons; (4) increase in oxidation state/number


 * Oxidation Number**: The oxidation number/state of an atom in a compound is equal to its theoretical charge if all the atoms were joined together by electrovalent bonds.


 * Oxidising Agent**: A substance which brings about oxidation, itself is being reduced. It is an acceptor of electrons.


 * Redox:** shorthand for reduction-oxidation reaction. Oxidation and reduction take place together. In other words, there can be no oxidation without reduction and vice versa.


 * Reducing Agent**: A substance which brings about reduction, itself is being oxidised. It is a donor of electrons.

(1) loss of oxygen; (2) gain of hydrogen; (3) gain of electrons; (4) decrease in oxidation state/number
 * Reduction**: Any one of the following changes in a chemical reaction is reduction -