Do Now•Describe the difference between an ionic bond and a

covalent bond.

Aim•What do we know about chemical bonding so far?

Basics• Atoms form bonds to become stable

• When atoms bond, they attain the electron configuration of

• But which one?

BasicsHow do we know how many electrons an atom loses or gains?

Lewis Structures1. Draw the atomic symbol

2. Draw one dot per the atom has

Ionic Bonding• Ionic bonds form between and

• We call these compounds

• In an ionic bond, electrons are from one atom to another

Ionic Bonding• Draw a Lewis Structure for NaCl • Draw a Lewis Structure for K2S

Covalent Bonding• Covalent bonds form between two

• We call these compounds

• In a covalent bond, electrons are between both atoms

• Each bond represents electrons

Covalent Bonding• Draw a Lewis Structure for CH4 • Draw a Lewis Structure for NH3

Covalent Bonding• Two structures with the same chemical formula are called

• Draw two structures for C2H6O

Complex Ions• A molecule can act as an ion• Draw the Lewis Structure of the molecule, then make it look like a salt• Example: CaCO3

Complex Ions• Some complex ions violate the

• For these we use oxidation states

• Oxidation states represent

Complex Ions• Draw a Lewis Structure for SO4

- • Draw a Lewis Structure for CrO42-

Questions, comments, concerns?