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Classification of Elements January 15, 2010
Objectives ,[object Object],[object Object],[object Object]
 
Henry Mosley (1914) ,[object Object],[object Object],[object Object]
 
Periodic Law ,[object Object],[object Object]
Metals ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object]
Non-metals ,[object Object],[object Object],[object Object],[object Object],[object Object]
Metalloids ,[object Object],[object Object],[object Object],[object Object]
Elements are arranged: Vertically into   Groups or Families Horizontally Into   Periods
Every element in a  family  has the same number of  valence   electrons
Definition of Valence Electrons ,[object Object],[object Object],[object Object],[object Object]
The  group 2  atoms all have  2 electrons  in their outer shells Be (Beryllium) Atom Mg (Magnesium) Atom
If you looked at an atom from each element in a  period Each atom has the same number of electron  shells .
The  period 4  atoms each have  4 electron   containing shells K (Potassium)  Atom Fe (Iron) Atom Kr (Krypton)  Atom 4 th  Shell

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Classification Of Elements

  • 1. Classification of Elements January 15, 2010
  • 2.
  • 3.  
  • 4.
  • 5.  
  • 6.
  • 7.
  • 8.
  • 9.
  • 10.
  • 11. Elements are arranged: Vertically into Groups or Families Horizontally Into Periods
  • 12. Every element in a family has the same number of valence electrons
  • 13.
  • 14. The group 2 atoms all have 2 electrons in their outer shells Be (Beryllium) Atom Mg (Magnesium) Atom
  • 15. If you looked at an atom from each element in a period Each atom has the same number of electron shells .
  • 16. The period 4 atoms each have 4 electron containing shells K (Potassium) Atom Fe (Iron) Atom Kr (Krypton) Atom 4 th Shell