5. Which contains more atoms? Circle one for each letter.
a. 12 g of hydrogen, H or 12 g of carbon, C
b. 27 g of aluminum, Al or 27 g of iron, Fe
c. 40 g of calcium, ca or 40 g of sodium, Na
d. 40 g of calcium, ca or 60 g of zinc, Zn
e. 10 g lithium, Li or 100 g of lead, Pb