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atomic number 69

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1. n. a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime Source: wordnet

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apatite earth element emits group isotope machines metallic monazite occurs portable rare silvery small soft X-ray x-rays xenotime

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atomic atomic bomb atomic clock atomic cocktail atomic energy Atomic Energy Commission

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