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  • Not really.
  • Something about the atoms and ions?
  • Come on down.
  • Do you understand?
  • Hey Nick, do you know what Ms Ong  is teaching recently?
  • oh ya I understand, that's a pretty easy topic to me.
  • I'm very confused with the electrons 
  • Always remember this formula: 2,8,8. That's the maximum electrons allowed. The first shell allows maximum 2 electrons, the 2nd shell allows maximum of 8. Same as the third shell, it's max is 8.
  • In an atom there is this particle called the electrons. They are arranged in electon shells.
  • Ooh , now I understand! We need to fill up as much possible for the first two shells.
  • Si
  • Let's take silicon as an example.
  • Silicon has 14 electrons. So the configuration would be 2,8,4.
  • What about the stable stuff?
  • I heard my teacher said that negative ion is called anion.
  • Ahhh, I understand now.
  • Si
  • In this case, we need to gain 4 more electrons this is then called a negative ion.  
  • If there is a 4 on the 3rd shell, the best way is to add 4 more. If 4 or more, add to the difference. If there is lesser, deduct to the difference.
  • So that means those in group 0 of the periodic table are stable?
  • I see.
  • Si
  • Stable electric configuratation is for 2 or 2,8 or 2,8,8.
  • They usually do not need to add or deduct. They are only for the noble gases.
  • Exactly!
  • Thanks for giving me a deeper understanding Nick.
  • You really made me know what does ions and atom mean.
  • No problem Pete!
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