Thermionic Emission – is the giving off of electrons from the surface of a hot metal.
Atomic Number – of an atom tells us the number of protons present in the atom.
Mass Number – of an atom tells us the number of protons plus neutrons present in the atom.
Isotopes – are atoms which have the same Atomic Number but different Mass Numbers.
Radioactivity – is the disintegration of unstable nuclei with the emission of alpha, beta or gamma radiation.
Law of Radioactive Decay – states that the number of disintegrations per second is proportional to the number of nuclei present.
Mass Number – of any element expressed in grams contains Avogadro’s Number of atoms.
Nuclear Fusion – is the joining together of two small nuclei to form one larger nucleus with the release of energy and neutrons.