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barium    音標拼音: [b'ɛriəm]
n. 鋇



barium
n 1: a soft silvery metallic element of the alkali earth group;
found in barite [synonym: {barium}, {Ba}, {atomic number 56}]

Barium \Ba"ri*um\, n. [NL., fr. Gr. bary`s heavy.] (Chem.)
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.
[Rarely written {barytum}.]
[1913 Webster]

Note: Some of the compounds of this element are remarkable
for their high specific gravity, as the sulphate,
called heavy spar, and the like. The oxide was called
barote, by Guyton de Morveau, which name was changed by
Lavoisier to baryta, whence the name of the metal.
[1913 Webster]



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英文字典中文字典相關資料:
  • Barium - Wikipedia
    Barium is a chemical element; it has 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
  • Barium Swallow: What to Expect, Side Effects, and Cost
    To do a barium swallow, you swallow a chalky white substance known as barium It’s often mixed with water to make a thick drink that looks like a milkshake When it’s swallowed, this liquid
  • Barium | Uses, Compounds, Facts | Britannica
    barium (Ba), chemical element, one of the alkaline-earth metals of Group 2 (IIa) of the periodic table The element is used in metallurgy, and its compounds are used in pyrotechnics, petroleum production, and radiology
  • Barium | Public Health Statement | ATSDR
    Barium is a silvery-white metal that takes on a silver-yellow color when exposed to air Barium occurs in nature in many different forms called compounds These compounds are solids, existing as powders or crystals, and they do not burn well
  • Barium - Element information, properties and uses | Periodic Table
    Element Barium (Ba), Group 2, Atomic Number 56, s-block, Mass 137 327 Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images
  • What Is a Barium Esophagram and Why Is It Done?
    A barium esophagram is an X-ray test that helps doctors spot swallowing problems and esophagus conditions Here’s what to expect before, during, and after
  • Barium Facts - Element 56 or Symbol Ba - Science Notes and Projects
    Barium is a chemical element with the symbol Ba and atomic number 56 It is an alkaline earth metal that is best known for the green color it adds to fireworks and for its use in barium enemas for x-ray imaging
  • Barium, Chemical Element - water, uses, elements, metal, number, name . . .
    Barium was first isolated in 1808 by English chemist Sir Humphry Davy (1778-1829) In 1807 and 1808, Davy also discovered five other new elements: sodium, potassium, strontium, calcium, and magnesium
  • Barium (Ba) - Periodic Table
    Barium was identified as a new element in 1774 by Carl Wilhelm Scheele Barium was first isolated by electrolysis of molten barium salts in 1808, by Sir Humphry Davy in England
  • Barium Element Facts - chemicool. com
    Barium is a metallic element chemically resembling calcium but more reactive It is a soft, silvery metal and when cut it quickly turns a black color due to the formation of barium oxide, (BaO)





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