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Definition of Eka-protactinium
1. Noun. Unbitrium (Ubt), an unsynthesized chemical element with atomic number 123. ¹
2. Noun. Unquadunium (Uqu), an unsynthesized chemical element with atomic number 141. ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Eka-protactinium
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