What is the size of an atom ?
AS much as I hate Wikipedia, they have a very nice chart to answer that:http://en.wikipedia.org/wiki/Atomic_radiusAnd to ForestTalker- of course there are units of measurement that are small enough. Nanometers and Picometers both yield manageable numbers of measure.
no unit of measurement is small enough to define that
Atoms are measured in Zeptos