The atomic symbols of nitrogen and oxygen are N and O, respectively. The chemical formula of a particular substance is NO2. Which of the following is a correct description of the substance?
A.
a compound made up of 2 nitrogen atoms and 2 oxygen atoms
B.
an element made up of 2 nitrogen atoms and 2 oxygen atoms
C.
a compound made up of 1 nitrogen atom and 2 oxygen atoms
D.
an element made up of 1 nitrogen atom and 1 oxygen atom
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