4SiO2

How do you determine the number of silicon atoms in the formula above?

A. # of Si atoms = subscript 4 X coefficient 2 = 6

B. # of Si atoms = coefficient 4 X subscript 1 = 4

C. # of Si atoms = coefficient 1 + Si subscript 1 = 2

D. # of Si atoms = coefficient 4 + subscript 1 = 5