Electron structure: Atomic structure and the periodic table: Chemistry: GCSE (9:1)

• First shell can hold

  2 electrons
• 2nd and 3rd shell can hold

  8 electrons
• no of shells =

  Period on the periodic table
• Valence electrons


  Outer shell electrons which are involved in reactions
• No of valence electrons =

  Group number on the periodic table
• Hydrogen electron structure


  1

  
• Nitrogen electron structure

  2,5

  
• Argon electron structure

  2,8,8

  
• Potassium electron structure

  2,8,8,1

  
• Calcium electron structure

  2,8,8,2

  
• Aluminium electron structure

  2,8,3

  
• Magnesium electron structure

  2,8,2

  
• Oxygen electron structure

  2,6

  
• Fluorine electron structure

  2,7

  
• Carbon electron structure

  2,4