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Dy,symbol for the element dysprosiumdysprosium
[Gr.,=hard to get at], metallic chemical element; symbol Dy; at. no. 66; at. wt. 162.500; m.p. 1,412°C;; b.p. 2,562°C;; sp. gr. 8.54 at 25°C;; valence+3. Dysprosium is a lustrous silvery metal; it is very soft and can be cut with a knife.
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