Nitrogen
/nˈaɪtrədʒən/
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Definition
(noun) The chemical element with an atomic number of 7 and atomic weight of 14.0067. It is a colorless and odorless gas.
Sentence Examples
The air we breathe consists of oxygen and nitrogen.
There are several irregularities in the nitrogen cycle.
CEFR Practice Quiz
The Earth's atmosphere is composed of approximately 78 percent ____ gas.