SNC 1D1
Chemistry: Models of Atomic Structure
Bohr-Rutherford Model of the Atom
Bohr-Rutherford Diagrams
1st shell
2nd shell
3rd shell
4th shell
Nucleus
Electron shells (
Nucleus (
Electrons (
)
)
)
Steps to draw Bohr-Rutherford Diagrams:
1. Write out a PEN statement: number of protons, electrons, neutrons
2. Draw a circle for the nucleus: write down the number of protons and neutrons in the nucleus.
3. Draw the first electron shell: draw a dot for each electron (at 12 and 6) – stop once you’ve placed
all electrons
4. Draw the second electron shell: draw a dot for each electron (at 12, 3, 6, 9); now, pair them up –
stop once you’ve placed all electrons
5. Repeat for the third and fourth electron shells.
**DO NOT MOVE ON TO THE NEXT ELECTRON SHELL UNTIL YOU HAVE FILLED THE
ONE BEFORE IT**