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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 .
This is a list of chemical elements and their atomic properties, ordered by atomic number (Z). ... atomic mass Electronegativity ... Rubidium: Rb: 85.4678(3) 0.82: 4. ...
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 ...
Rubidium, 37 Rb; Rubidium ... {Infobox element/periodic table}} (extends period 8 when atomic number ≥ 119. ... mass number comment: mass number comment: no ...
The standard atomic weight (A r °(Cu)) for copper is the average, weighted by their natural abundance, and then divided by the atomic mass constant m u. [ 1 ] The standard atomic weight of a chemical element (symbol A r °(E) for element "E") is the weighted arithmetic mean of the relative isotopic masses of all isotopes of that element ...
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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.
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