Oxidation numbers

• the oxidation number of an element is 0
• The oxidation number of a monatomic ion equals the charge of the ion
• The oxidation number of oxygen is -2 except in peroxides
• The oxidation number of hydrogen is +1 except in metal hydrides when it’s -1
• The oxidation number of fluorine is always -1
• The sum of the oxidation numbers of the atom in a polyatomic ion equals the charge in the ion
• Roman numerals are used to show the oxidation state of a metal within a compound
• Oxidation is the loss of electrons
• Reduction is the gain of electrons
• Oxidation is the gain of oxygen
• Reduction is the loss of oxygen
• Oxidation increases the oxidation state
• Reduction decreases the oxidation state