Radon

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Radon is a chemical element, having the chemical symbol Rn. Its atomic number (the number of protons) is 86. It has a standard atomic weight of 222 g•mol ⁻¹ and is a solid in its elemental form.

Radon is a monatomic noble gas. At a pressure of 101.325 kPa, it has a boiling point of  −71 °C and a melting point of  −61.7 °C.