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lan·tha·num
 lanthanum
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- pronunciation:
- laen
th
nm
- features:
- Word Combinations (noun)
| part of speech: |
noun |
| definition: |
a chemical element of the rare-earth group that has fifty-seven protons in each nucleus and that occurs as a soft, highly reactive, solid metal or as a trivalent ion. (symbol: La)
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