Bohr Diagrams

1
Bohr Diagrams

• A Bohr diagram is the basic representation of the
  atom
• and the location of its
• sub-atomic particles.

2
Drawing Bohr Diagrams

• The Basic Steps requires the use and knowledge of
  the Periodic Table.
• Determine the number of p, n e- .
• The number of electron in a neutral element
  will equal the protons.

19 K Potassium 39.0983
Atomic of Protons
3
Drawing Bohr Diagrams

• The Basic Steps requires the use and knowledge of
  the Periodic Table.
• Determine the number of energy levels.
• a) Determine the number of Valence e-
• b) Place on the outer energy level.
• 4) Place the remaining e- on the energy levels
  from the inside out. Use 2n2 as a guide to place
  maximum of e-

4
2n2 ? the maximum of e- that will fit in an
energy level.

• n ? is the energy level of the element. If
  it is on the 2nd period n 2 , if on the 5th
  period n 5
• If n5 then 2n2 2(5)2 50 e-
• The 5th energy level can have 50 e-

5
Bohr Diagram of Sodium
? 11p , 12n , 11e-

• 1. Determine the of p ,n, e-.
• 2. Determine the number of energy levels
• 3. Determine the number of Valence e-
• 4. Using 2n2 place remaining electrons on the
  energy levels from inside out.

? 3 energy levels
? Na is in group 1 ? 1 e-
11P 12N
1e-
2e-
8e-
6
How about Copper

• Copper is a transitional element ? it can change
  its valence electron number.
• 2) Cu has 29 p, 35n and 29 e-
• 3) It has 4 energy levels
• 4) Cu can have 1 or 2 valence e-
• Lets use 2 for this model.
• 5) Using 2n2 we fill inside out untill all e- are
  used up.

29p 35n
2e-
8e-
17e-
2e-