erbium

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erbium

(ûr`bēəm) [from Ytterby, a town in Sweden], metallic chemical element; symbol Er; at. no. 68; at. wt. 167.259; m.p. 1,529°C;; b.p. 2,863°C;; sp. gr. 9.05 at 25°C;; valence +3. Erbium is a soft, malleable, lustrous, silvery metal. It is a member of the lanthanide serieslanthanide series,
a series of metallic elements, included in the rare-earth metals, in Group 3 of the periodic table. Members of the series are often called lanthanides, although lanthanum (atomic number 57) is not always considered a member of the series.
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 in Group 3 of the periodic tableperiodic table,
chart of the elements arranged according to the periodic law discovered by Dmitri I. Mendeleev and revised by Henry G. J. Moseley. In the periodic table the elements are arranged in columns and rows according to increasing atomic number (see the table entitled
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. With other rare earths its oxide occurs in the mineral gadolinite, found in Sweden. Natural erbium is a mixture of 6 stable isotopes; in addition, 10 radioactive isotopes are known. Erbium does not oxidize in air as rapidly as some of the other rare-earth metalsrare-earth metals,
in chemistry, group of metals including those of the lanthanide series and actinide series and usually yttrium, sometimes scandium and thorium, and rarely zirconium. Promethium, which is not found in nature, is not usually considered a rare-earth metal.
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. Erbia is a rose-colored oxide of erbium; it has been used to a very limited extent in glazes and glass as a coloring agent. The discovery of erbium is generally credited to Carl G. Mosander, although he did not succeed in isolating the element. In 1843 he separated from gadolinite three oxide fractions that he called yttria, erbia, and terbia. Later, what he had called terbia became known as erbia and was shown to contain five distinct rare earths, now called erbia, scandia, holmia, thulia, and ytterbia. Fairly pure erbium oxide was first isolated in 1905; fairly pure erbium was isolated in 1934.

Erbium

 

Er, a chemical element. Atomic number, 68; atomic weight, 167.26. Erbium is one of the lanthanides.

erbium

[′ər·bē·əm]
(chemistry)
A trivalent metallic rare-earth element, symbol Er, of the yttrium subgroup, found in euxenite, gadolinite, fergusonite, and xenotine; atomic number 68, atomic weight 167.26, specific gravity 9.051; insoluble in water, soluble in acids; melts at 1400-1500°C.

erbium

a soft malleable silvery-white element of the lanthanide series of metals: used in special alloys, room-temperature lasers, and as a pigment. Symbol: Er; atomic no.: 68; atomic wt.: 167.26; valency: 3; relative density: 9.006; melting pt.: 1529?C; boiling pt.: 2868?C

erbium

A rare earth material used in optical amplifiers. See EDFA.