Chemical bonds and molecular models

 Compounds are composed of chemical bonds  Bonds are result of interactions between particles- electrons and protons  forces of attraction between atoms.

 Ionic Attraction between ions of opposite charges  Positive (cations) and negative (anions) ions are attracted to one another  Electrostatic attraction

 Covalent Electrons are shared between atoms

 The amount of information about the structure of the compound varies with the type of formula  All chemical formulas tell what elements are in the compound

 Most basic  Elemental symbols and quantity of each element in the compound

 Empirical Formula Relative number of atoms in a compound Most reduced form  NO 2  Molecular Formula Actual number of each element in a compound  N 2 O 4

 Represents covalent bonds with lines  shows how atoms in a molecule are connected or bonded together.

 Represent atoms as balls and chemical bonds as sticks  Shows shape of molecule

 Atoms fill space between each other to more closely represent our best estimates for how a molecule may appear if scaled