How many atoms are in a drop of mercury that has a diameter of 1.0 mm? (Volume of a sphere is 4 r3/3; density of mercury = 13.6 g/cm3)
A) 2.1 × 1019
B) 1.7 × 1020
C) 2.1 × 1022
D) 1.7 × 1023
E) none of the above
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