CEM 141 Lecture Notes - Lecture 34: Ionic Bonding, Boiling Point, Electronegativity
Document Summary
Predicting properties (like boiling point) from molecular formulas. It forms colorless crystals that are often cubic in shape and are hard and brittle. Conducts electricity when melted (but not in the solid so not metallic or like graphite) Can we explain this with our current models of bonding? no we need a new one. Contain a metal and a non-metal (eg. nacl). Contain one element with low electronegativity (metal) and one element with high electronegativity (non-metal). Each ion typically achieves noble gas configuration. This is a trade-off between energy required to gain or lose electrons, and stabilization of the system when ionic bonding interactions are formed. A group of atoms covalently bonded to each other. Simple cations formed when metals lose electrons (ie elements with low electronegativity). Charge usually corresponds to loss of electrons back to core but not because this is more stable loss of electrons always requires energy. Because energy is released when ion-ion interactions are formed.
