1. Bohr-Rutherford & Lewis Dot Diagrams

2. Review:
An atom is the smallest particle of an element which is still considered to be that element.
electrons are located outside of the nucleus
protons and neutrons are located inside the nucleus

3. Bohr-Rutherford Diagrams

4. Bohr-Rutherford Diagram – a visual representation of the arrangement of electrons around the nucleus of an atom.

6. Lets Draw Bohr-Rutherford Diagrams!

7. helium (2 electrons)
Lets draw .... He 2P 2N

8. Lets draw ....
fluorine (9 electrons) F
9P 10N

9. Lets draw...
Aluminum (13 electrons) Al
13P 14N

10. Electron Arrangements

11. Electron Arrangements & Bohr-Rutherford Diagrams
Valence Shell – the outermost electron shell
Valence Electrons – the electron(s) that occupy the outermost shell
valence electrons
valence shell

12. Patterns in Valence Electrons

13. Patterns in Valence Electrons

14. Patterns in Valence Shells

16. Lewis Dot Diagrams

17. beryllium (2 valence electrons)
Lets draw .... Be

18. silicon (4 valence electrons)
Lets draw .... Si

19. bromine (7 valence electrons)
Lets draw .... Br

20. Lewis Dot Diagrams