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Group 1 (Alkali metals) and Ag
+1 Charge - tend to loose 1 electron
Group 2 (Alkaline earth metals), Zn, and Cd
+2 charge - tend to loose 2 electrons
(Al and Ga)
+3 charge - tend to loose 3 electrons
Group 15
-3 - tend to gain 3 electrons
Group 16
-2 - tend to gain 2 electrons
Group 17
-1 - tend to gain 1 electron
Group 18
noble gases are mostly unreactive