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Niobium - Dictionary Definition and Overview |
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Niobium : (noun)
1: a soft gray ductile metallic element used in alloys; occurs
in niobite; formerly called columbium [syn: Nb, atomic
number 41]
Based on WordNet 2.0
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Niobium : \Ni*o"bi*um\, n. [NL., fr. L. & E. Niobe.] (Chem.)
A later name of columbium. See Columbium.
Based on Webster's Revised Unabridged Dictionary
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Columbium \Co*lum"bi*um\, n. [NL., fr. Columbia America.]
(Chem.)
A rare element of the vanadium group, first found in a
variety of the mineral columbite occurring in Connecticut,
probably at Haddam. Atomic weight 94.2. Symbol Cb or Nb. Now
more commonly called niobium.
Based on Webster's Revised Unabridged Dictionary
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Niobium : Symbol: Nb
Atomic number: 41
Atomic weight: 92.906
Soft, ductile grey-blue metallic transition element. Used in special
steels and in welded joints to increase strength. Combines with halogens
and oxidizes in air at 200 degrees celsius. Discovered by Charles Hatchett
in 1801 and isolated by Blomstrand in 1864. Called columbium originally.
Based on Webster's Revised Unabridged Dictionary (1913)
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