67Ho

Holmium

Lanthanidesolidblock f

The element with the highest magnetic moment of any, used in pole pieces that concentrate field and in the surgical lasers that break kidney stones.

Atomic number	67
Standard atomic weight	164.93 g/mol ± 0.01
Group · period	f-block series · 6
Electron configuration	[Xe] 4f¹¹ 6s²

About Holmium

Holmium's ten unpaired-electron configuration gives it a magnetic moment of 10.6 Bohr magnetons, the largest of any element, so a holmium pole piece inserted into an electromagnet concentrates flux and pushes the achievable field higher than the coil alone could manage. Its other everyday appearance is medical: the Ho:YAG laser at 2100 nm is strongly absorbed by water, making it the standard tool for fragmenting kidney stones and resecting prostate tissue with almost no thermal damage beyond the cut. Holmium oxide solutions have unusually sharp absorption peaks and are sold as the standard for calibrating the wavelength scale of a spectrophotometer. Named for Holmia, the Latin name for Stockholm.

Use 164.93 g/mol in these solvers

Moles from Mass (n = m/M)

n = \frac{m}{M}

Opens with M = 164.93 g/mol already filled in

Gas Density from Molar Mass

\rho = \frac{PM}{RT}

Opens with M = 164.93 g/mol already filled in

Faraday's Law of Electrolysis (m = QM/nF)

m = \frac{Q M}{n F}

Opens with M = 164.93 g/mol already filled in

Ion Concentration as CaCO₃ Equivalent

C_{\mathrm{CaCO_3}} = C_{\mathrm{ion}} \times \frac{50.04}{\mathrm{EW}}

Opens with EW = 164.93 g/mol already filled in

Acid Feed to Reduce Alkalinity

\dot m = \frac{\Delta \mathrm{Alk} \, Q \times \frac{\mathrm{EW}}{50.04}}{p/100\%}

Opens with EW = 164.93 g/mol already filled in

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