CHEM 1111 Chapter 5: Chapter 5 - Ionic and Covalent Compounds
Document Summary
Compound: substance composed of two or more elements combined in a specific ratio and held together by chemical bonds. Cannot be separated into simpler substances by a physical process. Lewis dot symbol: element"s symbol surrounded by dots, each of which represents a valence e- Don"t pair dots until necessary (like arrows in electron configuration) Main group metals: # of dots signify how many valence e- the metal loses to form a cation (to become isoelectronic with noble gas) Main group nonmetals: # of unpaired dots signifies how many bonds the atom can form. Due to incompletely filled inner shells, transition metals are not usually represented by them. Binary compound: substance that consist of just two different ions derived from two different elements - one nonmetal and one metal. Ionic bonding: electrostatic attraction between oppositely charged particles. Lattice: a three dimensional array of anions and cations; structure of anions and cations is such that all the compounds are electrically neutral.
