Element: Rubidium (Ru)

Element (Atom) NameRubidium
SymbolRu
Physical state at room temperatureSolid
Element ClassificationMetal
Group NameAlkali Metal
Group number (Periodic table)1
Period Number (Periodic table) 5
Atomic number37
Atomic Weight85.468 (Ref: science.co.il)
85.4678 (Ref: Jlab-ele037, Ciaaw-rubidium)
85.47 (Ref: Lanl-37)
Atomic Radius303 pm (Van der Waals) (Ref: Lanl-37)
Density1.53 g/cm3  (Ref: Jlab-ele037)
Melting point39.31°C (Ref: Jlab-ele037)
39.3 °C (Ref: Lanl-37)
Boiling point688°C (Ref: Jlab-ele037, Lanl-37)
Electron configuration1s2 
2s2 2p6 
3s2 3p6 3d10 
4s2 4p6 
5s1
Oxidation States+1 (Ref: Jlab-ele037)
+1, −1 ​(a strongly basic oxide) (Ref: Lanl-37)
Ionization Energy4.177 eV (Ref: Jlab-ele037)
Number of Stable Isotopes1

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