Electron configuration

• Period


  Period 2
• Electron Configuration of the First 20 Elements


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• Group 4


  Carame 5
• 23


  2. V
• Si


  14 P
• JS


  16 Cl
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  1. The number of electrons in an atom is equal to number of pralens
• As you move down a group


  Each element gains a new shell (e.g. elements in period 1 have 2 shell, period 2 have)
• As you move across a period

  The number of electrons increases by one every element
• Each element in the same group will have the same number of outer shell electrons
• Elements can either have 2 or 8 electrons in their shell
• The exception is group
• Election Configuration and the Periodic Table

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• Configuration arrangement


  Number Elections
• en the
• Electees Shells


  Elections ene arranged in shells
• Shells


  • Each shell can only hold a certain number of electrons
  • They are filled from the inside outwards
• Number of electrons per shell

  • Shell 1 - max. 2 electrons
  • Shell 2 - max. 8 electrons
  • Shell 3 - up to 8 electrons
  • Shell 4 - up to 2 electrons (for the first 20 elements)