Rubidium (Rb) in the periodic table — PeriodicTable

Rubidium (Rb) in the periodic tableRubidium is element 37, an alkali metal of the s block, in group 1, period 5. Its ground-state configuration is [Kr] 5s1, and it usually shows the oxidation states 0, 1.It was discovered in 1861, by Bunsen etKirchhoff.Name origin: the Latin rubidus, 'deep red'. Blank rows are columns the sheet does not measure for this element.

Property

Value

Unit

Atomic weight

85.4678

Da

Electronegativity

0.82

First ionisation energy

403

kJ/mol

Covalent radius

211

pm

Van der Waals radius

303

pm

Melting point

312.46

K

Boiling point

961

K

Density

1.532

g/cm³

Abundance

90

mg/kg

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