Monday, November 1, 2010 /5:56 PM
Electronic Structure:
Drawing Electron Dot Diagram:
-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
-four orbitals (one of each side of the nucleus) each holding a maximum of 2 electrons
Example:
Draw the Lewis Dot Diagram for the following elements:
--Lithium
--Potassium
Lewis Diagrams for compounds and ions:
-in covalent compounds electrons are shared
Steps:
1. Determine the number of valence electron for each atom in the molecule.
2. Place atoms so that valence electron are shred to fill each orbital.
Example:
Draw the Lewis Dot Diagrams for the following compound:
--Sulphur Difluoride
--Hexane [C6H14]
Double and Triple Bonds:
-sometimes the only way covalent compounds can fill all their valence levels is if they share more than one electron
Example:
Draw the Lewis Dot Diagram for the following:
--Ethylene [C2H4]
Ionic compounds:
-in ionic compounds electrons transfer from one element to another
-determine the number of valence electron ont eh cation move these to the anion
-draw [ ] around the metal and non-metal
-write the charge outside the brackets
Example:
Draw the Lewis Dot Diagram for the following compound:
--Berylium Oxide
~christina chow :]
