The nucleus of the atom is the heaviest part of the atom.
- The nucleus consists of neutrons and protons
- Both neutrons and protons have masses, but only protons have charges
- The nucleus contains all the positive charges of an atom
- The mass of an atom is the sum of the numbers of protons and neutrons in a nucleus
When the ratio of neutrons to protons is too high, the nucleus becomes unstable and Beta emission has to take place.
- In beta emission, an extra neutron gives rise to a proton and an electron
- The electron is ejected from the nucleus
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