Edexcel IAL Unit 5.2 Nuclear Decay Definitions

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Across
  1. 2. _____ Radiation: H​igh energy photons, it is weakly ionising, travels at the speed of light and has no charge so is not deflected by magnetic or electric fields.
  2. 4. __________ Radiation: ​Constant radiation everywhere that is due to radioactive substances in the environment.
  3. 6. Nuclear Fusion: T​he joining of two smaller nuclei to form a larger nucleus and to release energy.
  4. 8. ______ Mass Unit: ​1/12 the mass of a Carbon-12 nuclei.
  5. 9. ____ Radiation: ​Radiation consisting of a high energy electron or positron that is mildly ionising, fast moving and negatively charged so therefore deflected by a magnetic field.
  6. 10. Einstein’s Mass-______ Equivalence: ​Mass and ______ are equivalent, with the ______ equivalent of a given mass being equal to the product of the mass and the speed of light squared.
  7. 12. ___________ Nature of Nuclear Decay: ​Radioactive decay is ___________ - you cannot control when a nucleus will decay.
Down
  1. 1. ____-life: ​The time taken for ____ of the radioactive nuclei to decay.
  2. 3. _____ Radiation: ​The radiation of a particle containing two protons and two neutrons. It is strongly ionising, slow moving and positively charged so therefore deflected by a magnetic field.
  3. 5. ______ Nature of Nuclear Decay: ​Radioactive decay is ______ - you cannot predict when a nucleus will decay or which nucleus will decay next.
  4. 6. Nuclear _______: ​The splitting of a large nucleus to produce smaller nuclei, fast moving neutrons and energy.
  5. 7. ​A form of an element with the same number of protons but different numbers of neutrons.
  6. 9. _______ Energy: ​The energy required to split a nucleus into its individual nucleons. The greater the binding energy per nucleon the more stable the nucleus is.
  7. 11. ____ Deficit: ​The difference between the ____ of the nuclei and its individual components. If this ____ defect is large and positive then when a nuclei undergoes fission this ____ defect is released as energy. If this ____ defect is negative then when two nuclei are fused together the mass defect is released as energy.