Elemental barium does not occur naturally. It is obtained by heating BaO with Al and, once refined, barium is a silvery white, soft metal which oxidises readily in air and water. Barium compounds, particularly BaSO4 , are used for various applications, including the manufacture of paint, as an addition to heavy duty drilling oils and in radiology.
- Discovered by the Swedish pharmacist and chemist Carl Wilhelm Scheele in 1774 and first isolated by the British chemist Humphry Davy in 1808.
- 500 ppm of Earth's crust.
|Atomic / Molecular Weight||137.33||gmol-1||Clip|
|Specific heat capacity||192||Jkg-1K-1||Clip|