Friday, October 22, 2010

LESSON 8 continued: Bohr's model

1. Draw the Bohr Diagram for the element:  Aluminum                              
    
     Protons = 13
     Atomic mass = 27
     Neutrons = 27-13 = 14
                                                              
     3 Valence electrons (electrons in the outer shell)



2. Draw the Bohr Diagram for the element: Magnesium
   
    

    Protons = 12
    Atomic Mass = 24
    Neutrons = 12

    2 Valence electrons (outer shell)




·         Bohr Model
Ø  Atoms are electrically neutral
Ø  Two different models can be used to describe electron configuration
§  Energy Level Model
o   Electrons occupy shells which are divided into orbitals
¤   2 e- in the first orbital
¤   8 e- in the second orbital
¤   8 e- in the second orbital
§  Bohr Model



·         Energy Level Model

i.e. Phosphorus








·         Bohr Diagram

i.e. Phosphorus



   Protons = 15
   Atomic Mass = 31
   Neutron = 16

   5 Valence electrons










~ Kelly Bui ~

posted by chemistry11 @ 8:35 PM

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