Chemistry

• Electron Configuration


  The arrangement of electrons in an atom around the nucleus in shells
• The electrons in an atom occupy the lowest available shell or energy level
• Electron shell capacity for first 20 elements


  • First shell can hold max 2 electrons
  • Next two shells can each hold max 8 electrons
• Electron configuration


  Shows how the electrons are arranged around the nucleus in shells
• Quick Test


  1. Describe the plum-pudding model of the atom

  2. State the number of protons, neutrons and electrons in a potassium atom

  3. Describe the Bohr model of the atom