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Rhodium is a chemical element, having the chemical symbol Rh. Its atomic number (the number of protons) is 45. It has a standard atomic weight of 102.9055 g•mol −1 and is a solid in its elemental form.
Rhodium is considered to be a member of the "Transition metal" class of elements. At a pressure of 101.325 kPa, it has a boiling point of 3,695 °C and a melting point of 1,964 °C.