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Flashcards in Unit 3 Nuclear Chemistry Deck (5)
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why are isotopes radioactive?

they have an unstable nucleus (i.e. more neutrons than protons)


why is energy emitted from radioactive isotopes?

they emit energy as they spontaneously rearrange to reduce the size of the nucleus (this is nuclear decay)


what are the tree types of radiation

alpha, beta and gamma


what is the mass and charge of each type of radiation?

alpha - helium particle with a mass of 4, charge of 2
beta - electron with mass of 0 and change of -1
gamma - electromagnetic waves - no mass or charge


how can each type of radiation be stopped?

alpha - paper or a few centimetres of air
beta - a thin sheet of aluminium
gamma - thick layer of concrete