65Tb158.92535
Terbium
Lanthanide
Solid at STP
Period 6Block FDiscovered 1843
[Xe]6s2 4f9
Terbium is a chemical element with symbol Tb and atomic number 65. It is a silvery-white rare earth metal that is malleable, ductile and soft enough to be cut with a knife. Terbium is never found in nature as a free element, but it is contained in many minerals, including cerite, gadolinite, monazite, xenotime and euxenite.
📖 Read more on Wikipedia →Atomic Properties
| Atomic Number | 65 |
| Atomic Mass | 158.92535 u |
| Electron Configuration | [Xe]6s2 4f9 |
| Oxidation States | +3 |
| Atomic Radius | 221 pm |
| Ionization Energy | 5.864 eV |
| Block | F |
Physical Properties
| Appearance | silvery white |
| Standard State | Solid |
| Melting Point | 1629 K (1355.8 °C) |
| Boiling Point | 3503 K (3229.8 °C) |
| Density | 8.23 g/cm³ |
| Molar Heat | 28.91 J/(mol·K) |
| CPK Color | #30FFC7 |
Classification
| Category | Lanthanide |
| Group Block | Lanthanide |
| Period | 6 |
| Block | F |
Discovery
| Year Discovered | 1843 |
| Discovered By | Carl Gustaf Mosander |
| Electron Shells | 2, 8, 18, 27, 8, 2 |