Periodic Table Worksheet Page 2
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269
71
7. Gallium is 60.3%
Ga which has an atomic mass of 68.926 amu and 39.7% Ga which has an atomic
mass of 70.925 amu. Calculate the average atomic mass of gallium.
8. In a few words describe the Millikan’s oil drop experiment.
9. Calculate the number of atoms in each sample.
a. 14.995 g P
b. 12.899 g Ba
c. 39.733 g S
10. Calculate the mass, in grams, of each sample.
22
a. 2.82 x 10 helium atoms.
27
b. 8.15 x 10 nickel atoms.
29
c. 5.48 x 10 lithium atoms.
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