Rubidium in the environment. Rubidium-87 is an isotope of rubidium.Rubidium-87 was the first and the most popular atom for making Bose–Einstein condensates in dilute atomic gases.Even though rubidium-85 is more abundant, rubidium-87 has a positive scattering length, which means it is mutually repulsive, at low temperatures. The number of electrons and neutrons in Rubidium (and of course every other element) varies, but in a neutral state (no electric charge, the number of protons and electrons are equal) Rubidium has 37 electrons, and its most stable isotope has 48 neutrons in its nucleus. Atomic number (number of protons in the nucleus): 37 ... Atomic weight (average mass of the atom): 85.4678; Density: 0.886 ounces per cubic inch (1.532 grams per cubic cm) ... Rubidium … Rubidium can be taken up by cells of the body, but these ions are not poisonous. One estimate of the age of the solar system as 4.6 billion years is based on the ratio of rubidium-87 to strontium-87 in a stony meteorite. There are two naturally occurring isotopes in rubidium, rubidium-85 is the stable and more abundant isotope, while rubidium … Rubidium is the chemical element with the symbol Rb and atomic number 37. Rare Earth Elements, Basic Information | Atomic Structure | Isotopes | Related Links | Citing This Page. This is not to be confused with the relative percentage isotope abundances which totals 100% for all the naturally occurring isotopes. Then multiply the percent abundance as a … Name: Rubidium Symbol: Rb Atomic Number: 37 Atomic Mass: 85.4678 amu Melting Point: 38.89 °C (312.04 K, 102.002 °F) Boiling Point: 688.0 °C (961.15 K, 1270.4 °F) Number of Protons/Electrons: 37 Number of Neutrons: 48 Classification: Alkali Metal Crystal Structure: Cubic Density @ 293 K: 1.532 g/cm 3 Color: silver Atomic Structure The average atomic mass of rubidium is 85.467 u. Number of protons in Rubidium is 37. In the above, the most intense ion is set to 100% since this corresponds best to the output from a mass spectrometer. The biological half-life of rubidium is around 50 days. Atomic Number of Rubidium. Atomic weight of Rubidium is 85.4678 u or g/mol. Rubidium-87. Rubidium salts are used in glasses and ceramics and in fireworks to give them a purple colour. Isotope abundances of rubidium. Atomic Number of Rubidium. First, the exact atomic mass of each isotope must be obtained. Isotopes of Rubidium. Melting point of Rubidium is 39 °C and its the boiling point is 688 °C. Number of Electrons (with no charge): 37; Number of Neutrons (most common/stable nuclide): 48; Number of Protons: 37; Oxidation States: 1; Valence Electrons: 5s 1 Electron Dot Model. The atomic number of Rubidium is 37, meaning it has 37 protons. A large number of radioactive isotopes have been artificially prepared, from rubidium-79 to rubidium-95. This prevents a collapse of all but the smallest condensates. Potential uses are in ion engines for space vehicles, as working fluid in vapor turbines, and as getter in vacuum tubes. Rubidium-87 atom is the stable isotope of rubidium with relative atomic mass 86.909184, 27.9 atom percent natural abundance and nuclear spin 3/2. Chemical Properties of Rubidium. Atomic Number of Rubidium is 37.. Chemical symbol for Rubidium is Rb. An electron can spin either in clockwise or anti-clockwise direction, therefore the spin quantum number can have two values, + ½ or – ½. 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