67164.93HoHolmium
Holmium (Ho) — element 67lanthanide · period 6
Holmium is a chemical element with the symbol Ho and atomic number 67. It is a lanthanide in period 6 of the periodic table (the f-block), with a standard atomic mass of 164.93 u. At room temperature (25 °C) holmium is a solid.
💡 Known for: Has the highest magnetic moment of any naturally occurring element; used in magnets and medical lasers.
# Holmium properties
| Symbol | Ho |
|---|---|
| Atomic number | 67 |
| Atomic mass | 164.93 u |
| Category | lanthanide |
| Group | — (f-block, no group number) |
| Period | 6 |
| Block | f-block |
| Electron configuration | [Xe] 4f¹¹ 6s² |
| Full configuration | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹¹ 5s² 5p⁶ 6s² |
| Electrons per shell | 2, 8, 18, 29, 8, 2 |
| Protons / electrons | 67 / 67 |
| State at 25 °C | solid |
| Melting point | 1734 K (1460.8 °C, 2661.5 °F) |
| Boiling point | 2993 K (2719.8 °C, 4927.7 °F) |
| Density | 8.795 g/cm³ |
| Electronegativity (Pauling) | 1.23 |
| First ionization energy | 6.022 eV |
| Atomic radius | 226 pm |
| Discovered | 1867 |
# Electron configuration of holmium
The electron configuration of holmium is [Xe] 4f¹¹ 6s², written out in full as 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹¹ 5s² 5p⁶ 6s². Its 67 electrons fill 6 shells as 2, 8, 18, 29, 8, 2, so the outermost shell holds 2 electrons.
# Related elements
DyDysprosiumprevious elementErErbiumnext elementLaLanthanumlanthanideCeCeriumlanthanidePrPraseodymiumlanthanideNdNeodymiumlanthanidePmPromethiumlanthanideSmSamariumlanthanideEuEuropiumlanthanideGdGadoliniumlanthanide
# Holmium FAQ
What is the atomic number of holmium?
The atomic number of holmium is 67: every holmium atom has 67 protons in its nucleus. Its symbol is Ho.
What is the atomic mass of holmium?
The standard atomic mass of holmium is 164.93 u.
What is the electron configuration of holmium?
Holmium's electron configuration is [Xe] 4f¹¹ 6s² (1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹¹ 5s² 5p⁶ 6s²), with 2, 8, 18, 29, 8, 2 electrons per shell.
Is holmium a metal?
Yes. Holmium is a lanthanide, one of the metals.
What is the melting point of holmium?
Holmium melts at 1734 K (1460.8 °C, 2661.5 °F) and boils at 2993 K (2719.8 °C, 4927.7 °F).
What is holmium used for / known for?
Has the highest magnetic moment of any naturally occurring element; used in magnets and medical lasers.