Replies to post #251202 on Tornado Alley (PROG)

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Diameter of an Atom
An atom is one of the basic units of matter. Everything around us is made up of atoms. An atom is a million times smaller than the thickest human hair. The diameter of an atom ranges from about 0.1 to 0.5 nanometers (1 × 10-10 m to 5 × 10-10 m).
http://hypertextbook.com/facts/MichaelPhillip.shtml

Atomic Radius of the elements
http://periodictable.com/Properties/A/AtomicRadius.v.html

Atomic radius
https://en.wikipedia.org/wiki/Atomic_radius