BOHR-RUTHERFORD AND
LEWIS DOT DIAGRAMS
BOHR-RUTHERFORD DIAGRAMS
A Bohr-Rutherford diagram is a
simplified representation of an
element. It is a simple visual way of
expressing an element.
BOHR-RUTHERFORD DIAGRAMS
Bohr-Rutherford diagrams should be
drawn using the following steps:
 Draw the nucleus with the proper
number of protons (+1) and
neutrons (0).
 Draw the first electron shell with the
appropriate number of electrons (-1).
BOHR-RUTHERFORD DIAGRAMS
 Draw the second valence shell (if
applicable) with the appropriate
number of electrons (-1).
 Continue to draw valence shells with
electrons until you have the proper
number of electrons for the element.
Example: sulfur
1st shell 2; 2nd shell 8; 3rd shell 6
Magnesium (Mg) and Calcium (Ca)
1st shell 2; 2nd shell 8; 3rd shell 2
1st shell 2; 2nd shell 8;
3rd shell 8; 4th shell 2
Lewis Electron Dot Diagrams
Invented by the American chemist, G.N.
Lewis.
1. Write the chemical symbol
2. Write the appropriate number of dots
in a clockwise manner
Lewis Electron Dot Diagrams
Lewis Electron Dot Diagrams
You should notice that elements in the same
group have IDENTICAL electron dot
diagrams, except for the chemical symbol.
Ex. Lithium (Li) and sodium (Na) are both in
Group I, thus they only have one valence
electron and therefore only one dot in their
respective electron dot diagrams.
Lewis Electron Dot Diagrams
Ex. Fluorine (F) and chlorine (Cl) are
both in Group VII, and have seven
valence electrons, and therefore
seven dots in their respective
electron dot diagrams.