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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 .
Rubidium, 37 Rb; Rubidium ... {Infobox element/periodic table}} (extends period 8 when atomic number ≥ 119. ... mass number comment: mass number comment: no ...
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 ...
This is a list of chemical elements and their atomic properties, ordered by atomic number (Z).. Since valence electrons are not clearly defined for the d-block and f-block elements, there not being a clear point at which further ionisation becomes unprofitable, a purely formal definition as number of electrons in the outermost shell has been used.
The stabilisation of ununennium's valence electron and thus the contraction of the 8s orbital cause its atomic radius to be lowered to 240 pm, [36]: 1729–1730 very close to that of rubidium (247 pm), [5] so that the chemistry of ununennium in the +1 oxidation state should be more similar to the chemistry of rubidium than to that of francium.
This is the basis of rubidium–strontium dating. Of the unstable isotopes, the primary decay mode of the isotopes lighter than 85 Sr is electron capture or positron emission to isotopes of rubidium, and that of the isotopes heavier than 88 Sr is electron emission to isotopes of yttrium. Of special note are 89 Sr and 90 Sr.
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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.