Radioactive Decay

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Radioactive Decay. What happens to the nucleus of an atom when it emits a radiation?. Starter : Think about the reaction between Mg and O  BRIGHT WHITE LIGHT What is happening? Too easy? Think about the particles. . MgO. Magnesium loses 2 electrons – gives them to oxygen
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Radioactive DecayWhat happens to the nucleus of an atom when it emits a radiation?Starter:Think about the reaction between Mg and O  BRIGHT WHITE LIGHT What is happening?Too easy? Think about the particles. MgOMagnesium loses 2 electrons – gives them to oxygenOxygen therefore gains 2 electrons. ~ a simple example showing that atoms can gain / lose electrons in NORMAL Reactions.Learning Outcomes
  • H: complete equations to show the effect on the nucleus of the emission of alpha or beta particles
  • H: explain what isotopes are.
  • Isotopes
  • Isotopes are atoms of the same element with different mass numbers
  • That is;
  • Same Atomic Number
  • Same no. of protons
  • Different Mass Number
  • Different no. of neutrons
  • Isotopes of hydrogenIsotopes of hydrogenTritiumProtiumDeuterium1 proton, 0 neutron, 1 electron1 proton, 1 neutron, 1 electron1 proton, 2 neutron, 1 electronIsotopesAlpha Decay
  • When an unstable nucleus emits an alpha particle it loses 2 protons and 2 neutrons
  • For example,Radium 226 decays by alpha emission2262224RaRn+He88862Note: The atomic and mass numbers on both sides of the equation balance.Beta decay – more complex
  • A beta particle is an electron. But where does this electron come from?
  • When an unstable nucleus emits an electron, a neutron in its nucleus changes into a proton and an electron. The electron is emitted.
  • For example
  • Polonium-218 decays by beta emission2182180PoAte+8485-1Note: The atomic and mass numbers on both sides of the equation balance.Gamma Decay
  • After an alpha or beta particle has been emitted from the nucleus of an isotope, the nucleus has too much energy.
  • To get rid of that excess energy, a gamma wave is emitted.
  • Summary
  • Alpha Decay
  • Beta Decay
  • Gamma Decay
  • a wave of energy 2262224RaRn+He888622182180PoAte+8485-1Task
  • Complete the card sort “decay series”
  • Task:
  • produce a poster showing clearly the types of nuclear decay.
  • C- explain each type of decay
  • B – give chemical examples which show the number of p, n and e before and after decay.
  • A – describe the relative dangers of each type of ionising radiation linking each to what they are made of.
  • Plenary – Block Busters
  • http://www.teachers-direct.co.uk/resources/quiz-busters/quiz-busters-game.aspx?game_id=10700
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