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haf·ni·um
 hafnium
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- pronunciation:
- haef
ni
 m
- features:
- Word Combinations (noun)
| part of speech: |
noun |
| definition: |
a chemical element that has seventy-two protons in each nucleus and that occurs as a tetravalent metal often found in combination with zirconium, used in pure form for applications such as nuclear reactor control rods because it absorbs neutrons well. (symbol: Hf)
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