51Sb121.760
Antimony
Metalloid
Solid at STP
Period 5Group 15Block PDiscovered Ancient
[Kr]5s2 4d10 5p3
Antimony is a chemical element with symbol Sb (from Latin:stibium) and atomic number 51. A lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite (Sb2S3). Antimony compounds have been known since ancient times and were used for cosmetics; metallic antimony was also known, but it was erroneously identified as lead upon its discovery.
📖 Read more on Wikipedia →Atomic Properties
| Atomic Number | 51 |
| Atomic Mass | 121.760 u |
| Electron Configuration | [Kr]5s2 4d10 5p3 |
| Oxidation States | +5, +3, -3 |
| Electronegativity | 2.05 (Pauling) |
| Atomic Radius | 206 pm |
| Ionization Energy | 8.64 eV |
| Electron Affinity | 1.07 eV |
| Block | P |
Physical Properties
| Appearance | silvery lustrous gray |
| Standard State | Solid |
| Melting Point | 903.78 K (630.6 °C) |
| Boiling Point | 1860 K (1586.8 °C) |
| Density | 6.685 g/cm³ |
| Molar Heat | 25.23 J/(mol·K) |
| CPK Color | #9E63B5 |
Classification
| Category | Metalloid |
| Group Block | Metalloid |
| Period | 5 |
| Group | 15 |
| Block | P |
Discovery
| Year Discovered | Ancient |
| Discovered By | unknown, before 3000 BC |
| Electron Shells | 2, 8, 18, 18, 5 |