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  • bottom number in box for element in periodic table

Atoms & Molecules - Atoms consist of protons, neutrons and electrons

  • isotopes

  • atoms of same element that vary in neutron number and atomic mass

  • isotopes of carbon

  • carbon 12C

  • carbon 13C

  • carbon 14C

Atoms & Molecules - Atoms consist of protons, neutrons and electrons

  • Isotopes can be

  • stable

    • nuclei remain permanently intact

  • unstable (or radioactive)

  • nuclei decays spontaneously, giving off particles and energy

Atoms & Molecules - Atoms consist of protons, neutrons and electrons

  • Isotopes can be

    • unstable (or radioactive)

      • nucleus tends to break up into elements with lower atomic numbers

      • emits significant amount of energy, called radioactive decay

        • »

          radioactive isotopes

»

Atoms & Molecules - Radioactive isotopes can help us or harm us

  • Radioactive isotopes can be

  • harmful to life

Atoms & Molecules - Radioactive isotopes can help us or harm us

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