62Sm150.4
Samarium
Lanthanide
Solid at STP
Period 6Block FDiscovered 1879
[Xe]6s2 4f6
Samarium is a chemical element with symbol Sm and atomic number 62. It is a moderately hard silvery metal that readily oxidizes in air. Being a typical member of the lanthanide series, samarium usually assumes the oxidation state +3.
📖 Read more on Wikipedia →Atomic Properties
| Atomic Number | 62 |
| Atomic Mass | 150.4 u |
| Electron Configuration | [Xe]6s2 4f6 |
| Oxidation States | +3, +2 |
| Electronegativity | 1.17 (Pauling) |
| Atomic Radius | 229 pm |
| Ionization Energy | 5.644 eV |
| Block | F |
Physical Properties
| Appearance | silvery white |
| Standard State | Solid |
| Melting Point | 1347 K (1073.8 °C) |
| Boiling Point | 2067 K (1793.8 °C) |
| Density | 7.52 g/cm³ |
| Molar Heat | 29.54 J/(mol·K) |
| CPK Color | #8FFFC7 |
Classification
| Category | Lanthanide |
| Group Block | Lanthanide |
| Period | 6 |
| Block | F |
Discovery
| Year Discovered | 1879 |
| Discovered By | Lecoq de Boisbaudran |
| Electron Shells | 2, 8, 18, 24, 8, 2 |