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ACTINIUM

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89

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Ac

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(227)

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2-8-18-32-18-9-2

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1050° C

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3200° C (estimated)

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+3

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FCC

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radioactive

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source of alpha rays

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It is found in radioactive ores, used in equilibrium with its decay products as a source of alpha rays.  Discovered in 1899 by Debierne.