There is no element that has been named kolmium. And kolmium hydroxide is the name of the hydroxide of the element kolmium.
Maybe you have made a typo and intended to ask for the formula of holmium hydroxide. Holmium is a rare earth element with the atomic number 67. The metal was isolated in the year 1878 and has been named after Stockholm, a city in Sweden.
Holmium has unusual magnetic properties that make it an ideal element for use in making magnets and ferromagnetic substances. It is also used to regulate nuclear reactions and as a coloring agent for glass.
The hydroxide of holmium is hydrated and the chemical formula of holmium hydroxide is `Ho(OH)_3.xH_2O`
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