Electron Arrangement

Electron Arrangement

1. The electrons in an atom are arranged in shells (the rings around the nucleus)

   • The 1st shell (the ring closest to the nucleus) is allowed up to 2 electrons.
     • The 2nd, 3rd, 4th etc can hold up to a maximum of 8 electrons

2. To find out how many electrons there will be in the shells you have to...

   • Look at the periodic table to find out the period and the group number of the element
     • Vertical = Group and Horizontal = Period
       • Add the two numbers together and thats how many electrons there are on the shells
         • For example... F ( Fluorine)
           • Period = 2
           • +
             • Number of Electrons = 9
           • Group = 7
           • There will be 2 electrons in the first shell and 7 in the second
             • Here is the finished drawing.

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