- a whitish, malleable, active, divalent, metallic element, occurring in combination chiefly as barite or as witherite. Symbol: Ba; atomic weight: 137.34; atomic number: 56; specific gravity: 3.5 at 20°C.
Origin of barium
Examples from the Web for barium
Will she be able to illuminate a screen treated with platino-cyanide of barium?The Shadow World
The chromates of lead and barium separate as yellow precipitates.
Oxides of lead, zinc, and barium are often used in this way.
What weight of barium sulphate will be formed at the same time?
Sulphates, estimated as barium sulphate, and calculated to K2SO4.The Handbook of Soap Manufacture
W. H. Simmons
- a soft silvery-white metallic element of the alkaline earth group. It is used in bearing alloys and compounds are used as pigments. Symbol: Ba; atomic no: 56; atomic wt: 137.327; valency: 2; relative density: 3.5; melting pt: 729°C; boiling pt: 1805°C
Word Origin and History for barium
1808, coined in Modern Latin by its discoverer, English chemist Sir Humphrey Davy (1778-1829), because it was present in the mineral barytes "heavy spar" (barium sulphate), so named by Lavoisier from Greek barys "heavy" (see grave (adj.)). The metal is actually relatively light.
- A soft alkaline-earth metal that is a component in compounds used in radiography and as radiopaque media. Atomic number 56.
- A soft, silvery-white metallic element of the alkaline-earth group. It occurs only in combination with other elements, especially in barite. Barium compounds are used in x-raying the digestive system and in making fireworks and white pigments. Atomic number 56; atomic weight 137.33; melting point 725°C; boiling point 1,140°C; specific gravity 3.50; valence 2. See Periodic Table.