Electronic Structure

Drawing Electron Dot Diagrams

-The nucleus is represented by the atomic symbol. 

- For individual elements determine the number of valence electrons.

- Electrons are represented by dots around the symbol.

- 4 orbitals (one of each side of the nucleus).

each holding a maximum of 2e. 

Lewis Diagrams for Compounds & Ions

- In compounds electrons are shared

1. Determine the # of valence e- for each atom.

2. Place atoms so that valence e- are shared to fill each orbital.

Double and Triple Bonds

- Sometimes the only way covalent compounds can fill all their valence levels is if they share more than one electron.

Ionic Compounds

- In ionic compounds electrons transfer from one element to another.

- Cation (metal - positive charge)

- Anion (non-metals - negative charge) 

Lewis Diagrams for Polyatomic Ions

1. Determine the # of valence e- for each atom in the molecule.

2. Subtract one electron for each positive charge.

3. Add one electron for each negative charge. 

Links:

The link giving step by step instructions on how to draw an electron dot diagram (shown in class)

1. http://www.youtube.com/watch?v=y6QZRBIO0-o

more info on Lewis structures of atoms, ions, and compounds.

2. http://www.ausetute.com.au/lewisstr.html

Jomar Delos Santos