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  2. Rubidium - Wikipedia

    en.wikipedia.org/wiki/Rubidium

    Rubidium is a chemical element; it has symbol Rb and atomic number 37. It is a very soft, whitish-grey solid in the alkali metal group, similar to potassium and caesium. [9] Rubidium is the first alkali metal in the group to have a density higher than water.

  3. Isotopes of rubidium - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_rubidium

    Rubidium-87 was the first and the most popular atom for making Bose–Einstein condensates in dilute atomic ... Rubidium-87 has an atomic mass of 86.9091835 u, and a ...

  4. Period 5 element - Wikipedia

    en.wikipedia.org/wiki/Period_5_element

    Rubidium is the first element placed in period 5. ... Its atomic mass is 91.224. It is a lustrous, gray-white, strong transition metal that resembles titanium.

  5. Template:Infobox rubidium - Wikipedia

    en.wikipedia.org/wiki/Template:Infobox_rubidium

    {{Infobox element}}; labels & notes: (Image) GENERAL PROPERTIES Name Symbol Pronunciation (data central) Alternative name(s) Allotropes Appearance <element> IN THE PERIODIC TABLE Periodic table Atomic number Standard atomic weight (data central) Element category (also header bg color) (sets header bg color, over 'series='-color) Group Period ...

  6. Specific activity - Wikipedia

    en.wikipedia.org/wiki/Specific_activity

    One gram of rubidium-87 and a radioactivity count rate that, after taking solid angle effects into account, is consistent with a decay rate of 3200 decays per second corresponds to a specific activity of 3.2 × 10 6 Bq/kg. Rubidium atomic mass is 87 g/mol, so one gram is 1/87 of a mole. Plugging in the numbers:

  7. Atomic radii of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Atomic_radii_of_the...

    Just as atomic units are given in terms of the atomic mass unit (approximately the proton mass), the physically appropriate unit of length here is the Bohr radius, which is the radius of a hydrogen atom. The Bohr radius is consequently known as the "atomic unit of length". It is often denoted by a 0 and is approximately 53 pm. Hence, the values ...

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  9. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    When atomic mass is shown, it is usually the weighted average of naturally occurring isotopes; but if no isotopes occur naturally in significant quantities, the mass of the most stable isotope usually appears, often in parentheses. [8] In the standard periodic table, the elements are listed in order of increasing atomic number.