Nuclear size
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The size of an atomic nucleus is of the order of 10 ^{− 15} − 10 ^{− 14} metres.

Nuclear radius

The nucleus has approximately a constant density and therefore the nuclear radius R can be approximated by the following formula,

R = r₀A^{1 / 3}

where, A = Atomic mass number [ # of protons (Z) plus # of neutrons (N) ] and r₀ = 1.25 fm = 1.25 10 ^{− 15} m (r₀ varies by .2 fm depending on the nuclei) . Literature: Krane, Kenneth S., Introductory Nuclear Physics, Wiley, 1987.

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