Its oxide was first isolated from rare-earth ores by Cleve in 1878. The element’s name comes from Holmia, the Latin name for the city of Stockholm. Elemental holmium is a relatively soft and malleable silvery-white metal….

The periodic table have the groups and periods. In the periodic table, there are 7 horizontal rows of elements are known as period and 18 vertical columns of elements are known as group. Hence, 1A, 3B, and 7A are examples of group number on the periodic table.

In chemistry and atomic physics, the main group is the group of elements (sometimes called the representative elements) whose lightest members are represented by helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, and fluorine as arranged in the periodic table of the elements.

Holmium is found in the ores monazite sand [(Ce, La, etc.) PO4] and bastn°site [(Ce, La, etc.)( CO3)F], ores containing small amounts of all the rare earth metals….Abundances of holmium in various environments.

Holmium

Hazards and risks associated with holmium: Holmium compounds are encountered rarely by most people. All holmium compounds should be regarded as highly toxic although initial evidence would appear to suggest the danger is limited. The metal dust presents a fire and explosion hazard.

Ho

Characteristics: Holmium is a bright, soft, silvery-white, rare earth metal that is both ductile and malleable. It does not react in dry air at normal temperatures, but rapidly oxidizes to a yellow oxide (Ho2O3) in moist air or when heated. Most holmium compounds are brownish yellow in color.

Holmium (Ho), chemical element, a rare-earth metal of the lanthanide series of the periodic table.

Geneva

Holmium alloys are used as a magnetic flux concentrator to create the strongest artificially-generated magnetic fields. It is also used in nuclear reactors for nuclear control rods. Holmium is one of the rarer of the rare-earth elements but is, nevertheless, 20 times more abundant than silver.