Ba

Barium

Atomic Number 56 · Metal piece in mineral oil

A soft, silvery alkaline earth metal. Barium sulfate is used as a radiocontrast agent for X-ray imaging of the digestive system.

Atomic Mass

137.33 u

Category

Alkaline Earth Metal

Phase (STP)

Solid

Density

3.594 g/cm³

Melting Point

727 °C

Boiling Point

1845 °C

Electronegativity

0.89 (Pauling)

Atomic Radius

215 pm

Electron Configuration

[Xe] 6s2

Discovered

1808 — Humphry Davy

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Sample form: Metal piece in mineral oil

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