Redox
Definition: reactions which both oxidation and reduction reactions take place at the same time.
Oxidation
Gain in oxygen
Lose of electrons
Lose of hydrogen
Increase in oxidation state number
Reduction
Lose of oxygen
Gain of electrons
Gain in hydrogen
Decrease in oxidation state number
Fixed Oxidation numbers
0
All elements, noble gases, metals
+1
Group 1 ions, H+
+2
Group 2 ions
+3
Al3+
-1
Group 7 ions, Oxygen in H2O2, hydrogen in Metal hydrides e.g NaH
-2
O2-, S2-.
-3
Nitrides N3-
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