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Element symbol Er, atomic number 68, in the periodic table of chemical elements in the sixth period, lanthanide (IIIB group) 11, atomic weight one hundred and sixty-seven point two six The element name comes from the discovery site of yttrium earth. In 1843, mossander, a Swedish scientist, discovered the oxide of erbium from yttrium soil by the method of graded precipitation, which was officially named in 1860. The content of erbium in the crust is 0.000247% , existing in many rare earth ores.
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