Atomic Structure and Radioactivity (THEORY)(IGCSE 0625 CLASSIFIED WORKSHEET) WITH ANSWERS

The worksheet includes 44 Theory Questions with answers

• Describe the structure of an atom in terms of a positive nucleus and negative electrons
• Describe how the scattering of α-particles by thin metal foils provides evidence for the nuclear atom
• Describe how the scattering of α-particles by thin metal foils provides evidence for the nuclear atom
• State the meaning of nuclear fission and nuclear fusion
• Balance equations involving nuclide notation
• Demonstrate understanding of background radiation
  • Describe the detection of α-particles, β-particles and γ-rays (β+
  are not included: β-particles will be taken to refer to β–)
  Discuss the random nature of radioactive emission
  • Identify α-, β- and γ-emissions by recalling
  – their nature
  – their relative ionising effects
  – their relative penetrating abilities
  (β+ are not included, β-particles will be takento refer to β–)
  Describe their deflection in electric fields and in magnetic fields
  • Interpret their relative ionising effects
  • Give and explain examples of practical applications of α-, β- and γ-emissions
  State the meaning of radioactive decay
  • State that during α- or β-decay the nucleus changes to that of a different element
  Use equations involving nuclide notation to represent changes in the composition of the nucleus when particles are emitted
  Use the term half-life in simple calculations, which might involve information in tables or decay curves
  Calculate half-life from data or decay curves from which background radiation has not been subtracted****
  Recall the effects of ionising radiations on livingthings
  • Describe how radioactive materials are handled,used and stored in a safe way