Nuclear Physics
size of atoms: take water (H2O)
atomic weight = 18 gm/mole, (alternately, get mass of one molecule from mass spectrograph)
Avagadro’s number = 6 x 1023/mole
(1 cm3/gm)*(18 gm/mole) / (6x1023molecules/mole)
= 3 x 10-23 cm3/molecule, so
datom = V1/3 = 3 x 10-8cm = 3 x 10-10 m.