The diameter of an atom varies between 62 and 520 pm, depending on on the specific type of atom.
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area of a circle is pi x radius^2 so... pi x 4^2 = about 50 cm
a moderate estimate, not expensive, reasonable in price
A reasonable estimate is 1000. The actual total is 1016.
A reasonable estimate of the sum of 78 and 119 is 197.
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