CHMA10H3 Lecture Notes - Lecture 18: Lewis Structure, Bravais Lattice, Lattice Energy

• School: UTSC
• Department: Chemistry
• Course: CHMA10H3
• Professor: Marco Zimmer

Document Summary

Chemical bond: it exists between two atoms of groups of atoms if the forces between them cause them to form an aggregate with sufficient stability to make it convenient to regard it as an independent molecular species. Atoms adjust their electron counts during a chemical reaction in order to become isoelectronic with a noble gas . Allows use to predict many properties of molecules (e. g. molecular stability, shape, size, polarity) When atoms form chemical bonds, only their outer regions come into contact. Use dots to keep track of the valence electrons. Ionic bond: electrostatic force that holds ions together in an ionic compound. Each element will be most stable with a complete octet. The formation of ionic compounds is exothermic. Should always consider lattice energy (the energy released when gas phase ions coalesce into a crystalline lattice) When an ionic compound forms, it arranges all the ions in a regular, repeating pattern called a crystal lattice.