P4 - What is radioactivity?

  • Created by: Naomi
  • Created on: 21-01-13 18:48
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  • What is radioactivity?
    • Radioactive decay
      • Radioactive substances decay naturally, giving out alpha, beta and gamma radiation
      • Nuclear radiation causes ionisation, by removing electrons from atoms or causing them to gain electrons
      • Radioactive decay is a random process, it isn't possible to predict when a nucleus will decay
      • The half-life of a radioisotope is the average time of half the nuclei present to decay. The half life cannot be changed
    • Alpha particles
      • Properties
        • Positivey charged
        • Has a large mass
        • Is a helium nucleus (2 protons, 2 neutrons)
        • Has helium gas around it
      • During decay
        • Mass number decreases by four
          • Loses 2 protons and 2 neutrons
            • Atomic number decreases by two
        • Atomic number decreases by two
    • When an alpha or beta particle is emitted from the nucleus of an atom, the remaining nucleus is a different element
    • Beta Particles
      • Properites
        • Negatively charged
        • Has a very small mass
        • Travels very fast
        • Is an electron
      • During decay
        • Mass number is unchanged
        • Atomic number increases by one
          • A neutron changes to a proton and an electron
            • Mass number is unchanged


Miss KHP


This is a wonderful mindmap to link different parts of radioactivity and help you link them. You can also print it out and highlight the keywords for yourself. Good for all exam boards.

felix pinney


very good

aleena mehboob


very gooooood

23456gfxcgfjvgnj ncbcfg


does it come in red?

Teen Wolf D


Thank You! I once read but I can remember everything!



  • its very useful especially for exams and easy to read and understand


Very useful for my physics test

Thanks a lot!!!

neha has been taken



Katie's cat


i thought that said gemma

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