Sites:
| ChemGlobe: Holmium: Electronic, thermal, and steric data along with an isotope table. | | ChemicalElements.com: Holmium: Basic information, atomic structure, and isotopes table. | | EnvironmentalChemistry.com: Holmium: Atomic structure, chemical and physical properties, and table of nuclides. | | Holmium: Data tables and historic information. | | It's Elemental: Holmium: Basic physical and historical information. | | LANL: Holmium: Basic information, history, and properties. | | Lenntech: Holmium: Physical data, chemical properties, health and environmental effects. | | Visual Elements: Holmium: Image, source, uses, key isotopes, and ionisation energies. | | WebElements: Holmium: Extensive information on history, uses, occurrence, compounds, and properties. | | Wikipedia: Holmium: Properties of the element, including its history, applications, and characteristics. |
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