Atomic Number
67
Element 67
Holmium (Ho)
Holmium is a chemical element with symbol Ho and atomic number 67. Part of the lanthanide series, holmium is a rare-earth element.
Atomic Mass
164.93 u
Category
Lanthanide
Period
6
Group
Lanthanide series
Phase
solid
Density
8.8 g/cm3
Electron Shells
2, 8, 18, 29, 8, 2
Atomic Structure
Protons: 67. Electrons: 67. Neutrons: Varies by isotope.
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹¹
Why Holmium Matters
Holmium helps connect atomic number 67, lanthanide behavior, period 6 trends, and electron shell structure. Its solid phase, atomic mass of 164.93 u, and electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹¹ make it useful for comparing bonding patterns across the periodic table.
Discovery and Occurrence
Holmium was discovered 1878 by Per Teodor Cleve, Jacques-Louis Soret, Marc Delafontaine. Holmium is a chemical element with symbol Ho and atomic number 67. Part of the lanthanide series, holmium is a rare-earth element.
Safety and Handling Context
Holmium is presented here for learning and comparison. Pure elements and laboratory compounds can have hazards that depend on dose, form, and setting.
Related Elements
Frequently Asked Questions
- What is the atomic number of Holmium?
- Holmium has atomic number 67, which means a neutral atom has 67 protons and 67 electrons.
- What is the chemical symbol for Holmium?
- The chemical symbol for Holmium is Ho.
- What category is Holmium in?
- Holmium is classified as a lanthanide and sits in period 6 of the periodic table.
Explore Holmium in 3D
Use the interactive table above to rotate atomic models, compare periodic trends, and move from Holmium to neighboring elements without losing your place.