Name: rhenium
Symbol: Re
Atomic number: 75
Atomic weight: 186.207 (1)
Group in periodic table: 7
Group name:
Period in periodic table: 6
Block in periodic table: d-block
CAS registry ID: 7440-15-5
Rhenium is silvery white with a metallic lustre; its density is exceeded only by that of platinum, iridium, and osmium, and its melting point is exceeded only by that of tungsten and carbon. It has other useful properties. It is expensive but useful as a trace alloying agent.