Examples of Isotopes

• Hydrogen (1 proton)

  • neutron Þ deuteron 2H
  • 2 neutrons Þ triton 3H

• Lithium (3 protons)

  • usually 3 or 4 neutrons (6Li, 7Li)
  • also exists with 5, 6 and 8 neutrons! (8Li, 9Li, 11Li)
  • Not with 2 or 7. Why?

• Why is 11Li so big?

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