Rhenium

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Rhenium is a chemical element, having the chemical symbol Re. Its atomic number (the number of protons) is 75. It has a standard atomic weight of 186.207 g•mol ⁻¹ and is a solid in its elemental form.

Rhenium is considered a member of the "Transition metal" class of elements. At a pressure of 101.325 kPa, it has a boiling point of 5,596 °C and a melting point of 3,186 °C.