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Group 1
+1 charge
Group 2
+2 charge
Groups 3–12
Variable charges (transition metals)
Group 13
+3 charge (common for aluminum)
Group 14
Variable charges (often +2 or +4 for metals)
Group 15
-3 charge (common for simple nonmetal ions)
Group 16
-2 charge (common for simple nonmetal ions)
Group 17
-1 charge
Group 18
0 charge (noble gases)
Lithium (Li)
+1
Sodium (Na)
+1
Potassium (K)
+1
Magnesium (Mg)
+2
Calcium (Ca)
+2
Barium (Ba)
+2
Aluminum (Al)
+3
Nitrogen (N)
-3
Phosphorus (P)
-3
Oxygen (O)
-2
Sulfur (S)
-2
Fluorine (F)
-1
Chlorine (Cl)
-1
Bromine (Br)
-1
Iron (Fe)
+2 or +3
Copper (Cu)
+1 or +2