Editing Holmium (section)

===Physical properties===

With a boiling point of {{convert|3000|K|C F|0}}, holmium is the sixth most [[Volatility (chemistry)|volatile]] lanthanide after [[ytterbium]], [[europium]], [[samarium]], [[thulium]] and [[dysprosium]]. At standard temperature and pressure, holmium, like many of the second half of the lanthanides, normally assumes a [[hexagonal crystal system|hexagonally close-packed (hcp)]] structure.<ref>{{Cite journal |last1=Strandburg |first1=D. L. |last2=Legvold |first2=S. |last3=Spedding |first3=F. H. |date=1962-09-15 |title=Electrical and Magnetic Properties of Holmium Single Crystals |url=https://link.aps.org/doi/10.1103/PhysRev.127.2046 |journal=Physical Review |volume=127 |issue=6 |pages=2046–2051 |doi=10.1103/PhysRev.127.2046|bibcode=1962PhRv..127.2046S |url-access=subscription}}</ref> Its 67 [[electron]]s are arranged in the configuration [Xe] 4f<sup>11</sup> 6s<sup>2</sup>, so that it has thirteen [[valence electron]]s filling the 4f and 6s subshells.<ref name=":0">{{Cite web |title=Holmium (Ho) - Periodic Table |url=https://www.periodictable.one/element/67 |access-date=2024-06-02 |website=www.periodictable.one |language=en}}</ref>

Holmium, like all of the lanthanides, is [[paramagnetic]] at standard temperature and pressure.<ref>{{cite book|last1=Cullity|first1=B. D.|last2=Graham|first2=C. D.|year=2005|page=172|title=Introduction to Magnetic Materials}}</ref> However, holmium is [[ferromagnetic]] at temperatures below {{convert|19|K|C F}}.<ref>{{cite book|title=Introduction to magnetism and magnetic materials|author=Jiles, David|page=228|date=1998}}</ref> It has the highest [[magnetic moment]] ({{val|10.6|u=[[Bohr magneton|''μ''<sub>B</sub>]]}}) of any naturally occurring element<ref name="emsley226" /> and possesses other unusual magnetic properties. When combined with [[yttrium]], it forms highly [[magnetism|magnetic]] compounds.<ref name="appl" />