Atomic Number: 51
Atomic Weight: 121.760
Melting Point: 903.78 K (630.63°C or 1167.13°F)
Boiling Point: 1860 K (1587°C or 2889°F)
Density: 6.685 grams per cubic centimeter
Phase at Room Temperature: Solid
Element Classification: Semi-metal
Period Number: 5
Group Number: 15
Group Name: Pnictogen
The two Antimony isotopes are used for the production of medical radioisotopes. Sb-121 can be used for the production of I-124, although this medical radioisotope is usually produced via Te-124. Sb-121 and Sb-123 can both be used for the production of I-123, although the most common production route is via Xe-124 or Te-123.