Roentgenium
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Roentgenium is a chemical element, having the chemical symbol Ds and its atomic number (the number of protons) is 111. It has a standard atomic weight of 280 g•mol −1 and it is a solid in its elemental form.
Roentgenium is considered a member of the "Transition metal" class of elements. There is no available data for its boiling point or its melting point.