The radius of an atom of copper (Cu) is about 140 pm. (b) How many Cu atoms would have to be placed side by side to span a distance of 5.0 mm?

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First, convert the radius of a copper atom from picometers (pm) to millimeters (mm). Since 1 pm = 1 x 10^-12 meters and 1 mm = 1 x 10^-3 meters, you can convert the radius to millimeters.

Next, calculate the diameter of a copper atom. Since the radius is half of the diameter, multiply the radius by 2 to find the diameter in millimeters.

Determine how many copper atoms are needed to span 5.0 mm by dividing the total distance (5.0 mm) by the diameter of one copper atom in millimeters.

Set up the division to find the number of copper atoms: Total distance (5.0 mm) divided by the diameter of one copper atom (in mm).

Finally, perform the division to find the number of copper atoms that fit side by side in the given distance.

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