Making Light from Atoms
(1 cc / 1 gm) * (18 gms / mole) * (1 mole / 6.02 x 1023 molecules)
= 18 x 10-6 m3 / 6 x 1023 molecules
= 3 x 10-29 m3/molecule = 30 x 10-30 m3/molecule .
Therefore, the size is about (30 x 10-30 m3)1/3
= 3 x 10-10 m. Thus the size of an atom should roughly be about 0.1 nm .
(An Angstrom is a unit of length: 1A = 0.1 nm.)