How many atoms of each element does potassium nitrate, KNO3, contain?
A. Potassium = 3 atom, Nitrogen = 3 atom, Oxygen = 3 atoms
B. Potassium = 3 atom, Nitrogen = 1 atom, Oxygen = 3 atoms
C. Potassium = 1 atom, Nitrogen = 3 atom, Oxygen = 3 atoms
D. Potassium = 1 atom, Nitrogen = 1 atom, Oxygen = 3 atoms
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