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Oxidation number of group 1 metals
+1
Oxidation number of group 2 metals
+2
Oxidation number of Aluminium
+3
Oxidation number of Hydrogen
+1 but -1 in hydrides
Oxidation number of Flourine
-1
Oxidation number of Cl, Br, I
-1 except in compounds with oxygen and fluorine
Oxidation number of Oxygen
-2 except in peroxides as it is -1 and in compounds with fluorine
Reaction of metals and acid
ACID + METAL → SALT + HYDROGEN