atomic number 72
| Noun | 1.  atomic number 72 - a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons | 
| 单词 | atomic number 72 | ||
| 释义 | atomic number 72
 atomic number 72
 Synonyms for atomic number 72
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