Electron Arrangement

• Electron arrangement


  Electrons orbit the nucleus and are arranged in layers around the nucleus called energy levels or electron shells
• Energy levels


  Layers of electrons around the nucleus
• Lowest energy level


  The energy level closest to the nucleus
• Highest energy level


  The energy level furthest away from the nucleus
• The maximum number of electrons that can be put into the first energy level is 2
• The maximum number of electrons that can be put into the second energy level is 8
• Fluorine's electron arrangement


  • 2 electrons in the first energy level
  • 7 electrons in the second energy level
• Atomic number


  Total number of electrons in an element
• You will find the electron arrangements of all the elements on page 6 of your data book
• Electrons


  Type of charge: negative
• Proton


  Positively charged particle in the nucleus of an atom
• Neutron


  Particle found in the nucleus of an atom with no charge
• Electrons in an atom

  Found in shells or orbits around the nucleus
• Atoms are electrically neutral
• Diatomic elements


  • Oxygen
  • Chlorine
  • Fluorine
  • Bromine
  • Iodine
  • Hydrogen-Hz
  • Nitrogen - Nz
  • Iodine-Iz