When a nucleus is unstable due to too many neutrons, it will not emit neutrons.
He will have the ability to change one of his neutrons into a proton.
An electron will then be created during this transformation to maintain the total electrical charge of the system.
This transformation is beta-radioactivity.
The - indicates that the electron has a negative charge in this decay.
Beta-decay is therefore a characteristic of nuclei with an excess of neutrons.
The isotopes concerned make themselves more stable by transforming a neutron into a proton with the emission of a beta-electron and a particle called an antineutrino.
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