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.
unknown, Wikipedia Commons
By
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.
Learn about our Editorial Process
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.

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.)

What is an element?

Return to the Periodic Table

Format
mla apa chicago
Your Citation
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 June 10, 2023).