Most atoms will live forever if they are
stable. Atoms have a fixed number of protons
which determines which type of atom it is. Also,
atoms contain neutrons, which normally match the
number of protons. However, in some cases, the
number of neutrons may be different from the
number of protons, in which case the atom is
unstable and may be radioactive.
Radioactive means that the atom can "eject" other
particles so that it can become a more stable atom
that has the same number of protons and neutrons.
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