67Ho164.93033
Holmium
Lanthanide
Solid at STP
Period 6Block FDiscovered 1878
[Xe]6s2 4f11
Holmium is a chemical element with symbol Ho and atomic number 67. Part of the lanthanide series, holmium is a rare earth element. Holmium was discovered by Swedish chemist Per Theodor Cleve.
📖 Read more on Wikipedia →Atomic Properties
| Atomic Number | 67 |
| Atomic Mass | 164.93033 u |
| Electron Configuration | [Xe]6s2 4f11 |
| Oxidation States | +3 |
| Electronegativity | 1.23 (Pauling) |
| Atomic Radius | 216 pm |
| Ionization Energy | 6.022 eV |
| Block | F |
Physical Properties
| Appearance | silvery white |
| Standard State | Solid |
| Melting Point | 1747 K (1473.8 °C) |
| Boiling Point | 2973 K (2699.8 °C) |
| Density | 8.8 g/cm³ |
| Molar Heat | 27.15 J/(mol·K) |
| CPK Color | #00FF9C |
Classification
| Category | Lanthanide |
| Group Block | Lanthanide |
| Period | 6 |
| Block | F |
Discovery
| Year Discovered | 1878 |
| Discovered By | Marc Delafontaine |
| Electron Shells | 2, 8, 18, 29, 8, 2 |