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[ ? ] Alkaline Earth Metal:
Highly radioactive

Radium is a chemical element, having the chemical symbol Ra. Its atomic number (the number of protons) is 88. It has a standard atomic weight of 226 g•mol −1 and it is a solid in its elemental form.

Radium is considered a member of the "Alkali earth metal" class of elements. At a pressure of 101.325 kPa, it has a boiling point of 1,737 °C and a melting point of 700 °C.