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Niobium

/nˌaɪˈoʊbiəm/
B2
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Definition

(noun) A chemical element (symbol Nb) with an atomic number of 41: a light grey, crystalline, ductile transition metal used in superconducting materials.

Sentence Examples
Niobium is a chemical element with the symbol Nb.
CEFR Practice Quiz
____ is a chemical element used in some medical and industrial alloys.

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