Heavy metal
Heavy metals refer to metals whose density is above 5.0 g/cm³. They occur in the rocks of the earth’s crust and are firmly bound there in ores as oxides, sulfides, carbonates and also enclosed in silicates.
42Mo
Molybdenumgray metallic
43Tc
Technetiumshiny gray metal
59Pr
Praseodymiumgrayish white
61Pm
Promethiummetallic
64Gd
Gadoliniumsilvery white
66Dy
Dysprosiumsilbrig weiß
91Pa
Protactiniumbright, silvery metallic luster
98Cf
Californiumsilvery
99Es
Einsteiniumsilvery; glows blue in the dark