Holmium
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Holmium is a chemical element; it has symbol Ho and atomic number 67. It is a rare-earth element and the eleventh member of the lanthanide series of elements. It is a relatively soft, silvery, fairly
Holmium 2
Ho2O3, left: natural light, right: under a cold-cathode fluorescent lamp
A specimen of gadolinite
Erbium
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Erbium is a chemical element; it has symbol Er and atomic number 68. A silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements.
Holmium
…is the eleventh member of the lanthanide series. In the periodic table, it appears in period 6, between the lanthanides dysprosium to its left and erbium to its right, and above the actinide einsteinium. With a boiling point of 3,000 K (2,727 °C; 4,940 °F), holmium is the sixth most volatile lanthanide…
Erbium
Erbium(III) chloride in sunlight, showing some pink fluorescence of Er3+ from natural ultraviolet.
Erbium(III) oxide powder
Carl Gustaf Mosander, the scientist who discovered erbium, lanthanum and terbium