51Sb121.76
Antimony
MetalloidsIn-between elements with some metal and some non-metal properties. Many are semiconductors.
[Kr] 4d¹⁰ 5s² 5p³
- Atomic number
- 51
- Atomic mass
- 121.76
- Protons
- 51
- Neutrons
- 71 (most common)
- Electrons
- 51
- Shells
- 2, 8, 18, 18, 5
- State at 25 °C
- Solid
- Position
- Group 15, period 5
Proton (+)Neutron (0)Electron (−)
Discovered byKnown since ancient times
Its black sulfide ore, stibnite, was used as eye make-up in the ancient world. Its symbol Sb comes from the Latin stibium.
Did you know?
- Some traditional kohl and surma were made from stibnite.
- It is a metalloid.
Where it's found
- Stibnite ore
What it's used for
- Flame retardants
- Hardening lead in batteries
Try it
There's no safe home experiment for Antimony. Explore it with the animated atom above instead.