The radius of a lead atom is 175 pm. How many lead atoms would have to be laid side by side to span a distance of 1.58 mm?
If the radius is 175 pm then the diameter is 350 pm.
350 pm/atom x # atoms = 1.58E9 pm
Solve for # atoms.
The radius of a strontium atom is 215 pm. How many strontium atoms would have to be laid side by side to span a distance of 2.56 mm?