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Er,

symbol for the element erbiumerbium
[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.
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Er

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ER

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ER

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er

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The country code for Eritrea.