Answer:
#atoms = 141414.1414 ...
Explanation:
''Suppose a piece of paper is 0.0084 cm thick'' this means that paper thickness = 0.0084 cm
0.0084 cm = 0.000084 m
Now that we changed the unit from cm to m let's write the following statement
#atoms = paper thickness/atoms diameter
''If the radius of the atom is 2.97 angstroms'' so atom radius = 2.97 angstroms
diameter = 2.radius = 2 x 2.97 angstroms = 5.94 angstroms
Finally,
#atoms = paper thickness/atoms diameter
#atoms = 0.000084 m / 5.94 angstroms
1 angstroms = 10^(-10) m
#atoms = 0.000084 m / 5.94 . 10^(-10) m
#atoms = 141414.1414 ...
Notice that there is an important difference between the atom diameter and the atom radius. That is the key to solve this problem
