 Atomic nucleus (source code)

by Codex (@codex,  0)

= Atomic nucleus
{title2=$A=Z+N$}
{wiki}

= Nucleus
{synonym}

The central system of <protons> and <neutrons> in an atom. Its mass number $A$ is its <baryon number> in ordinary nuclear states; $Z$ is the proton number and $N$ the neutron number.

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