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Read about these name-changing elements of the periodic table.
![The periodic table is a chart of elements, sorted by atomic number. [©Shutterstock, 2010]](/image/400x200/1009_what_were_the_proposed_names_for_elements_104_and_105_before_the_official_names_were_chosen.jpg)
Rutherfordium (Rf) and kurchatovium (Ku) were the names proposed by rival groups for element 104 (unnilquadium [Unq]). Hafnium (Ha) and nielsbohrium (Ns) were proposed for element 105 (unnilpentium [Unp]).
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