Atoms

• How big is the radius of a nucleus in comparison to the radius of an atom?

  The radius of the nucleus is 1/10000 the size of the atom radius
• What did Chadwick discover?

  Neutron
• What is an isotope?

  A variant of an element with the same number of protons and electrons but a different number of neutrons in the nucleus
• What happens to an electron when it absorbs electromagnetic radiation?

  It moves to a higher energy level
• List the order of scientists discovering the parts of an atom

  • Dalton
  • Thompson
  • Rutherford
  • Bohr
  • Chadwick
• How can you remeber the order of the scientists who discovered parts of the atom?

  • Dont = Dalton
  • Try = Thompson
  • Remember = Rutherford
  • Names = Nils Bohr
  • Cleverly = Chadwick
• How can you remeber the discoveries of the scientists?

  • S = spheres
  • E = Electrons
  • N = Nucleus
  • O = Orbit
  • N = Neutrons
• How can you rember which discovery came first - neutrons or nucleus?

  Neutrons = new trons = nucleus came first
• What did Dalton believe?

  Atoms are tiny solid spheres that can't be divided
• What did Thompson discover?

  • Electrons
  • Plum pudding model
  • Atoms are a 'ball' of positive charge with negatives electrons embedded in it
• What did Rutherford discover?

  • Alpha particle scattering experiment
  • Nucleus
  • Positive charge concentrated in centre of atom
  • Nuclear model
• What did Bohr discover?

  • Adapted nuclear model
  • Electrons orbit the nucleus at specific distance
  • Shells