Pure Rubidium
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It has a melting point of 312.46 [or 39.31 °C (102.76 °F)] K and a boiling point of 961 [or 688 °C (1270 °F)] K. It's density of the solid is 532 kg m-3 . There are 32 known isotopes of rubidium. Natural rubidium consists of two isotopes, rubidium-85 (stable with 72.15% abundance) and rubidium-87 (27.85% abundance, a beta emitter with a half-life of 4.9 x 1010 years). Isotope rubidium-87 readily substitutes for potassium in minerals, and is therefore fairly widespread. Isotope-85 is the only stable one, constitutes 72% of rubidium.