Holmium Facts - Element Atomic Number 67

Chemical & Physical Properties of Holmium

Holmium is a soft and malleable rare earth element belonging to the lanthanide series of elements.
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Anne Marie Helmenstine, Ph.D.
Anne Marie Helmenstine, Ph.D.
Chemistry Expert
  • Ph.D., Biomedical Sciences, University of Tennessee at Knoxville
  • B.A., Physics and Mathematics, Hastings College
Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels.
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Updated on March 09, 2017

Holmium is atomic number 67 with element symbol Ho. It is a rare earth metal belonging to the lanthanide series.

Holmium Basic Facts

Atomic Number: 67

Symbol: Ho

Atomic Weight: 164.93032

Discovery: Delafontaine 1878 or J.L. Soret 1878 (Switzerland)

Electron Configuration: [Xe] 4f11 6s2

Element Classification: Rare Earth (Lanthanide)

Word Origin: Holmia, the Latinized name for Stockholm, Sweden.

This is a photo of europium in a glovebox under argon.
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Holmium Physical Data

Density (g/cc): 8.795

Melting Point (K): 1747

Boiling Point (K): 2968

Appearance: relatively soft, malleable, lustrous, silvery metal

Atomic Radius (pm): 179

Atomic Volume (cc/mol): 18.7

Covalent Radius (pm): 158

Ionic Radius: 89.4 (+3e)

Specific Heat (@20°C J/g mol): 0.164

Evaporation Heat (kJ/mol): 301

Pauling Negativity Number: 1.23

First Ionizing Energy (kJ/mol): 574

Oxidation States: 3

Lattice Structure: Hexagonal

Lattice Constant (Å): 3.580

Lattice C/A Ratio: 1.570

References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Lange's Handbook of Chemistry (1952), CRC Handbook of Chemistry & Physics (18th Ed.)

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Helmenstine, Anne Marie, Ph.D. "Holmium Facts - Element Atomic Number 67." ThoughtCo, Aug. 25, 2020, thoughtco.com/holmium-facts-element-atomic-number-67-606543. Helmenstine, Anne Marie, Ph.D. (2020, August 25). Holmium Facts - Element Atomic Number 67. Retrieved from https://www.thoughtco.com/holmium-facts-element-atomic-number-67-606543 Helmenstine, Anne Marie, Ph.D. "Holmium Facts - Element Atomic Number 67." ThoughtCo. https://www.thoughtco.com/holmium-facts-element-atomic-number-67-606543 (accessed April 19, 2024).