1. Lewis Structure Practice

2. Ionic Lewis Structures Metal and Nonmetal First determine the chemical formula if it is not given to you. Draw the Lewis structure for each atom Draw arrows showing electrons transferring from cation to anion Redraw the ions using brackets.

3. Ionic Lewis Structure Practice! 1. Magnesium Bromide 3. Aluminum Oxide 2. Li 2 S 4. NaF

4. Covalent Lewis Structures Write the symbols in correct arrangement (no dots yet!) – HINTS: Place least electronegative element in middle. Usually form more than 1 bond. Usually the first element listed – Hydrogen and Halogen atoms often only bond to one other atom and are usually on outside – Carbons usually bond to each other – Formula for complex molecules are often written out in a way that hints at its structure.

5. Covalent Lewis Structures Determine the total number of valence electrons Use 2 valence electrons to form a bond between each atom Place remaining electrons in pairs until there are 8 electrons around each atom (2 for H) or all electrons have been used – Extra electrons go on central atom – Atoms in 3 rd period and beyond can have more than 8 electrons around them

6. Covalent Lewis Structures If not enough electrons are available to give all atoms an octet, look for double bonds and triple bonds! Double check your work!!