Read about these name-changing elements of the periodic table.
©Shutterstock, 2010 The periodic table is a chart of elements, sorted by atomic number.
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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