Bond Types Ch 12-I

Science 8 – Three kinds of chemical bonds: Ionic – atoms gain or lose electrons and have a charge Covalent Bonds – two or more atoms “sharing” electrons Metallic Bonds – atoms with loosely held (delocalized) valence electrons Have you ever wondered why atoms create these bonds? Have you wondered why they create one type of bond versus another

Reasons for Atoms to Bond Reasons for Bonding: Two main causes: –Electrical attraction between protons and electrons –Magnetic attraction between electrons with opposite spins KEY IDEAS FOR CHEMISTS: –Bonding allows atoms to Release or Distribute Energy –The part of the atom that can most easily spread Energy is the _________________ –So… when we study bonding theories, we will need to focus on is the position and motion of _________________

Checkpoint: Bonding Forces –Forces that hold atoms together –Always involve this particle:____________ Somehow allow ___________________ to be released or distributed –The Forces Holding Atoms Together Can be e_______________________ m_______________________

12-1: Using “Desire” for electrons to Predict Bonding There is a “Bonding Continuum” from Ionic to Nonpolar (pg 464) Polarity of Bonds due to electronegativity of atoms involved in the bond Ionic Bonds –Electronegativity difference between Atoms is _________ or greater Polar Covalent Bonds –Electronegativity difference between Atoms is between ____ and ____ Nonpolar Covalent –Electronegativity difference between Atoms is _________ or less

Electronegativity Values

Electronegativity Difference