Particles, quantum phenomena and electricity

  • Created by: izzy
  • Created on: 07-06-13 10:46
  • Every atom has a positively charged nucleus at its centre that is ssurrounded by negatively charged particles called electrons.
  • The nucleus of the atom is composed of protons and neutrons which have approximatety equal mass.
  • Protons and electrons have fixed equal and opposite anounts of charge, and neutrons are uncharged.
  • An uncharged atom has equal numbers of electrons and protons.
  • Radioactive substances emit radiation because the nuclei of the atoms are unstable.
  • The radiation from radioactive substances ionises substances it passes through.
  • There are three types of radiation from radioactive substances
    • alpha radiation which is stopped by paper and is strongly ionising
    • beta radiation which is stopped by 2-3mm thickness of


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