Oxidation Numbers

IA (Hydrogen, Lithium, Sodium, Pottasium, Rubidium, Cesium, and Francium)
+1, except for Hydrogen which can also be -1
IIA (Beryllium, Magnesium, Calcium, Strontium, Barium, and Radium)
+2
IIIA (Boron, Aluminum, Gallium, Indium, and Thallium)
+3
IVA (Carbon, Silicon, Germanium, Tin, and Lead)
+4, -4, and +2
VA (Nitrogen, Phosphorus, Arsenic, Antimony, Bismuth)
+5, +3, and -3
VIA (Oxygen, Sulfur, Selenium, Tellurium, and Polonium)
+6, +4, +2, and -2 (Oxygen is -2 except in Peroxides where it is -1)
VIIA
-1
Zinc
+2
Silver
+1
x

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