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Wat (wie) is BARIUM - definitie

CHEMICAL ELEMENT WITH SYMBOL BA AND ATOMIC NUMBER 56

Element 56; Barium compounds; Barium poisoning; Barrium; Compounds of barium; Ba (element); Barium compound; History of barium

barium

Barium is a soft, silvery-white metal.

N-UNCOUNT

Barium

·noun One of the elements, belonging to the alkaline earth group; a metal having a silver-white color, and melting at a very high temperature. It is difficult to obtain the pure metal, from the facility with which it becomes oxidized in the air. Atomic weight, 137. Symbol, Ba. Its oxide called baryta.

barium

['b?:r??m]

¦ noun the chemical element of atomic number 56, a soft white reactive metal of the alkaline earth group. (Symbol: Ba)

?Medicine a mixture of barium sulphate and water, opaque to X-rays, which is swallowed to permit radiological examination of the stomach or intestines.

Origin

C19: from baryta + -ium.

Wikipedia

Barium

Barium is a chemical element with the symbol Ba and atomic number 56. It is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Because of its high chemical reactivity, barium is never found in nature as a free element.

The most common minerals of barium are baryte (barium sulfate, BaSO₄) and witherite (barium carbonate, BaCO₃). The name barium originates from the alchemical derivative "baryta", from Greek βαρὺς (barys), meaning 'heavy'. Baric is the adjectival form of barium. Barium was identified as a new element in 1772, but not reduced to a metal until 1808 with the advent of electrolysis.

Barium has few industrial applications. Historically, it was used as a getter for vacuum tubes and in oxide form as the emissive coating on indirectly heated cathodes. It is a component of YBCO (high-temperature superconductors) and electroceramics, and is added to steel and cast iron to reduce the size of carbon grains within the microstructure. Barium compounds are added to fireworks to impart a green color. Barium sulfate is used as an insoluble additive to oil well drilling fluid. In a purer form it is used as X-ray radiocontrast agents for imaging the human gastrointestinal tract. Water-soluble barium compounds are poisonous and have been used as rodenticides.

https://en.wikipedia.org/wiki/Barium

Voorbeelden uit tekstcorpus voor BARIUM

1. Other toxic materials include cadmium, lead oxide, barium and mercury.

2. EEStor is instead creating better nonconductive material for use between the metal sheets, using a chemical compound called barium titanate.

3. Chemicals, including mercury, fluorine, barium, chromium, and cobalt, that either leach from the waste or are used in processing, are blamed for skin rashes and respiratory problems.

4. These will consist of barium X–rays or, more likely, internal examination of the colon using fine tubes – colonoscopy or sigmoidoscopy.

5. "We really need more testing of the site around the school." Testing at DeLisle Elementary School also detected barium, chromium, lead, and mercury.