What color are these transition metal ions: Cu+, Zn2+, Sc3+, Ti4+
colorless
What color are these transition metal ions: Cr2+, Cu2+, V4+
blue
What color are these transition metal ions: Fe2+, Ni2+, V3+, Cr3+, Mn6+
green
What color are these transition metal ions: Co2+, Mn2+
pink
What color is Mn7+
violet
What color are these transition metal ions: Fe3+, Co3+, V5+, CrO4 2-
yellow
What color is Cr2O7 2-
orange
What color is Mn4+
brown