2 Chemical BondsChemical Bond: a mutual attraction between the nuclei and valence electrons of different atoms that bonds atoms together.Valence electrons: electrons available to be gained lost or shared to form chemical bonds.Located in the outer most s and p orbitals
4 Types of BondsCovalent bond: results from the sharing of electron pairs between two atomsIonic bond: results from the attraction between positively and negatively charged atomsMetallic bond: results from an attraction between metal atoms and a surrounding sea of electrons
5 Ionic BondsAtoms can gain or lose electrons to have a complete outer shell of electrons (valence electrons).Metals always lose electron and become positive.Aluminum has 3 valence e-. It will lose all its e- to have a +3 chargeNonmetals always gain electrons and become negative.Oxygen has 6 valence electrons. It will gain 2 e- to have 8 e- to have a -2 charge.
7 Polar Bonds Polar: an uneven distribution of charge Polar-Covalent Bond: a covalent bond in which the bonded electrons are shared unequallyNonpolar-Covalent Bond: a covalent bond with a balanced sharing of electrons
8 What type of bond??You can determine if a bond is nonpolar-covalent, polar-covalent, or ionic by looking at the difference in electronegativity.What is electronegativity?What does difference mean?Turn to pg 151 in your textbook.