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Group 1A
+1
Group 2A
+2
Fluorine
-1
Hydrogen
+1 Nonmetals (HCl, H2O, NH3)
-1 Metals or Boron (NaH, CaH2, BH3)
Oxygen
-2 NOT Peroxide/Superoxide
-1 Peroxide (2 Group 1A elements + 2 Oxygens: H2O2, Li2O2, K2O2)
-1/2 Superoxide (1 Group 1A element + 2 Oxygens: KO2, CsO2, NaO2)
Group 7A
-1 (ex: Cl, Br, I; Except when w/ oxygen)