The final nucleus will be larger than that of the original nucleus after beta decay.
The electron circles the proton, which creates the nucleus. All other elements, including the shown helium, have neutrons in addition to protons in their nuclei. The neutrons serve to hold the nucleus together whereas the positive charge protons have a tendency to reject one another.
The atom is made up of the subatomic particles electron, proton, and neutron. The atom is made up of a core nucleus that has neutrons and protons in it. The nucleus is surrounded by electrons. Neutrons are neutral, protons are positively charged, and electrons are negatively charged.
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