lesson 7

• Atomic structure

  The number of protons in an atom is equal to its atomic number
• Isotopes

  • Atoms with the same number of protons but different number of neutrons
• Radioactivity

  The property possessed by some elements ( such as uranium or isotopes) of spontaneously emitting energetic particles.
• Uses of Radioisotopes

  • Used in many smoke detectors for home and businesses
  • used to inspect airline luggage for hidden explosives
  • used to treat cancerous tumors
  • used in xrays