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Avogadro's number is a constant that helps scientists count atoms and molecules. It is approximately equal to 602,200,000,000,000,000,000,000. How is this number expressed in scientific notation?
A. (6.02)/10²³
B. 1/6.02* 10²³
C. 6.02/10²³
D. 6.02* 10²³
E. 6.02* 10²³