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metals that can form only one type of cation.
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what groups are type 1 in
1A, 2A, Sc (3), Al (3)
what elements are type 1
Ag, Al, Cd, Ga, Zn
what is type two
everything else
example of type two
Ammonium, NH4^+
example of type two
mercury(I), Hg2²^+