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HAFNIUM

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72

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Hf

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178.50

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2-8-18-32-10-2


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13.1

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2222° C

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5400° C

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+4

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HCP

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brilliant, silvery metal

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nuclear control rods, in nuclear reactors, getter for oxygen & nitrogen

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The existance of this element was assumed by chemists and for a long time there was a blank space in the periodic chart.  Hafnium was discovered in 1923 by Coster, Hevesy.