Bohr Model

• atoms are electrically neutral
• two different models can be used to describe electron configuration

1.   Energy Level Model
2.   Bohr Model

• electrons occupy shells which are divided into orbitals
• 2 e´ in the first orbital
• 8 e´ in the second orbital  --->
• 8 e´ in the third orbital     --->      Octet

Sulphur (S):

• protons: 16
• neutrons: 16
• electrons: 16
• energy level model:

              6 e´
              8 e´
              2 e´

• bohr model:

   Sodium (Na):

• protons: 11
• neutrons: 12
• electrons: 11
• energy level model:

               1 e´
               8 e´
               2 e´

• bohr model:

   -Eva