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Atoms in elemental form charge
0
Group 1 atoms charge
+1
Atoms in Group 2 charge
+2
Hydrogen in combination with nonmetals
+1
Hydrogen in combination with metals
-1
Fluorine charge
-1 always
Oxygen charge when not combined with F
-2
Oxygen in peroxides (O22-)
-1
Oxygen in Superoxides (O2-)
-1/2
Oxygen in Ozonides (O3-)
-1/3
Halogens
-1 in most compounds, unless the other elements include oxygen or more electronegative halogens