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Names of Trans-Fermium Elements 101-110

The American Chemical Society has adopted the following names for elements 101 to 110 for its primary and secondary publications. These names were adopted by IUPAC and endorsed by the ACS Committee on Nomenclature. The new names differ in only two cases from the names supported by the ACS Committee on Nomenclature and adopted by the ACS publications in 1995. From 9/97, Dubnium replaced Hahnium for element 105 and Bohrium replaced Nielsbohrium for element 107.

   Element  New Name         Symbol  Previous CA Name  CAS Reg No
   ~~~~~~~  ~~~~~~~~~~~~~~~  ~~~~~~  ~~~~~~~~~~~~~~~~  ~~~~~~~~~~
     101    Mendelevium        Md    Mendelevium        7440-11-1
     102    Nobelium           No    Nobelium          10028-14-5
     103    Lawrencium         Lr    Lawrencium        22537-19-5
     104    Rutherfordium      Rf    Rutherfordium     53850-36-5
==>  105    Dubnium            Db    Hahnium           53850-35-4
     106    Seaborgium         Sg    Seaborgium        54038-81-2
==>  107    Bohrium            Bh    Nielsbohrium      54037-14-8
     108    Hassium            Hs    Hassium           54037-57-9
     109    Meitnerium         Mt    Meitnerium        54038-01-6
     110    Darmstadtium       Ds    Ununnilium        54083-77-1

The CAS Registry nomenclature records for these two elements (and their isotopic and compound forms) are being updated to reflect the new names. Appropriate cross-references from the previous index names and synonyms will guide the users of the printed index. The previous names will also remain as synonyms on the CAS Registry File.