Back Ladungsradius German Radio nuclear Spanish Rayon de charge French Atommag#Atommagok tulajdonságai Hungarian 荷電半径 Japanese அணுக்கரு அளவு Tamil Zaryad radiusi Uzbek
The rms charge radius is a measure of the size of an atomic nucleus, particularly the proton distribution. The proton radius is about one femtometre = 10−15 metre. It can be measured by the scattering of electrons by the nucleus. Relative changes in the mean squared nuclear charge distribution can be precisely measured with atomic spectroscopy.