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-Identified until 1923, by Coster and Hevesy
-Named after Hafnia where it was discovered
- Nuclear reactor control
-Is a bright, silvery-gray metal that is very ductile.
-Melting point is about 2,150°C
- Boiling pointabout 5,400°C
-Its density is 13.1 grams per cubic centimeter.
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1.Good absorber of neutrons and is used in the control rods of nuclear reactors.
2.Used in vacuum tubes as a getter.
3.alloying agent
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# data[].attributes.headline
Symbol, atomic number & mass,& element name

# data[].attributes.subject
Symbol, atomic number & mass,& element name

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