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Charge radius
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<p>The <a href="/facts/Root_mean_square/Cfmg7dws">rms</a> charge radius is a measure of the size of an <a href="/facts/Atomic_nucleus/orpIm5Xl">atomic nucleus</a>, particularly the <a href="/facts/Proton/clCjepXP">proton</a> distribution. The proton radius is about one <a href="/facts/Femtometre/9XzQ8UmR">femtometre</a> = 10−15 <a href="/facts/Metre/hPhzc1CV">metre</a>. It can be measured by the scattering of <a href="/facts/Electron/L0KBo5cW">electrons</a> by the nucleus. Relative changes in the mean squared nuclear charge distribution can be precisely measured with <a href="/facts/Atomic_spectroscopy/wWffh016">atomic spectroscopy</a>. </p>