12 Facts About Holmium

Holmium is a chemical element with the symbol Ho and atomic number 67.

Holmium was discovered through isolation by Swedish chemist Per Theodor Cleve and independently by Jacques-Louis Soret and Marc Delafontaine, who observed it spectroscopically in 1878.

Holmium has the highest magnetic permeability and magnetic saturation of any element and is thus used for the polepieces of the strongest static magnets.

Holmium oxide has some fairly dramatic color changes depending on the lighting conditions.

Holmium was discovered by Jacques-Louis Soret and Marc Delafontaine in 1878 who noticed the aberrant spectrographic absorption bands of the then-unknown element .

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Holmium named the brown substance holmia and the green one thulia.

Holmium would have seen x-ray emission lines for both elements, but assumed that the dominant ones belonged to holmium, instead of the dysprosium impurity.

Holmium makes up 1 part per million of the soils, 400 parts per quadrillion of seawater, and almost none of Earth's atmosphere, which is very rare for a lanthanide.

Holmium obeys the Oddo–Harkins rule: as an odd-numbered element, it is less abundant than its immediate even-numbered neighbors, dysprosium and erbium.

Holmium has the highest magnetic strength of any element, and therefore is used to create the strongest artificially generated magnetic fields, when placed within high-strength magnets as a magnetic pole piece .

Holmium is one of the colorants used for cubic zirconia and glass, providing yellow or red coloring.

Holmium plays no biological role in humans, but its salts are able to stimulate metabolism.