Radioactivity

Radioactivity

1. decay

   • Alpha particle (helium nucleus) is emitted from the nucleus

2. decay

   • One neutron in the nucleus decays into a proton and a beta particle (electron). The beta particle is emitted from the nucleus.

3. Element symbols

   • Mass number = protons + neutrons
   • Atomic number = protons

4. decay

   • Gamma rays (high energy electromagnetic waves) are emitted from the nucleus.

5. Half life

   • The average time taken for half the nuclei to decay

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