Rb

Rubidium

Atomic Number 37 · Metal ampule in argon

A soft, silvery alkali metal that ignites spontaneously in air. Used in atomic clocks and specialty glass.

Atomic Mass

85.468 u

Category

Alkali Metal

Phase (STP)

Solid

Density

1.532 g/cm³

Melting Point

39.31 °C

Boiling Point

688 °C

Electronegativity

0.82 (Pauling)

Atomic Radius

235 pm

Electron Configuration

[Kr] 5s1

Discovered

1861 — Robert Bunsen

Find Rubidium Samples

Sample form: Metal ampule in argon

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