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Group 1
+1 (Zn is +2)
Cation (positive)
Group 2
+2
Cation
Ag
+1
Group 5A/15
N and P are -3
Cu
+1 or +2
Group 6A/16
O and S are -2
Fe
+2 or +3
Group 7A/17 (halogens)
-1
Anion (negative)
Pb
+2 or +4
Sn
+2 or +4