The radius of a strontium atom is 2.15 A˚ . How many strontium atoms would have to be laid side-by-side to give a row of strontium atoms 1.00 in. long? Assume that the atoms are spherical.
a) 1.5 x 10^9
b) 2.3 x 10^9
c) 4.7 x 10^9
d) 5.8 x 10^9