1. Chapter 20 Section 2: Types of Bonds

2. Important Vocabulary
Ion: an atom with a charge (positive or negative).
Ionic bond: the force of attraction between the opposite charges of the ions in an ionic compound.
Covalent bond: the attraction that forms between atoms when they share electrons.
Molecule: a neutral particle that forms as a result of electron sharing.
Polar molecule: a molecule that has a slightly positive end and a slightly negative end because one atom in the molecule is holding on to shared electrons tighter than another atom.
Nonpolar molecule: a molecule in which electrons are shared equally in bonds.

3. Bonding Atoms form bonds so each atom has 8 valence electrons.
This makes the atom stable.

4. Ionic Bonding
Ionic Bonds: between oppositely charged ions; usually on opposite sides of the periodic table (nonmetal and a metal)
transfer electrons
form networks, not molecules
conduct electricity

5. Covalent Bonds
Covalent Bonds: share electrons; usually between 2 elements close on the periodic table (2 nonmetals)
nonpolar covalent bond: e- shared equally
polar covalent bond: e- shared unequally