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  • Roentgenium
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  • Zr (Symbol of Zirconium)
  • 61 (Atomic Number of Promethium)
  • Atomic Mass of Terbium in lb
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N
Sy
Name
Atomic Mass
Series
Metals
Nonmetals
Lanthanides (All Group 3)6 Actinides (All Group 3)7