CHM 120 Lecture Notes - Lecture 15: Valence Electron, Lewis Structure, Chemical Bond
Document Summary
Bonding theories- are models that predict how atoms bond together to form compounds. The american chemist g. n lewis developed lewis model- We represent the valence electrons as dots. We draw lewis structure (or dot structure) to represent molecules. In a lewis dot structure each dot represents a valence electron. The dots are places around the elements symbol with maximums of two dots per side. Although the exact location of dots is not critical, here we fill the dots dingily first and then pair them (with the exception of helium) In lewis model, a chemical bond involves: the sharing of electrons or, the transfer of electrons. A stable electron configuration usually consists of eight electrons in the outermost shell (valence shell: is the electrons are transferred, the bond is an ionic bond, if the electrons are shared, the bond is a covalent bond. In chemical bonding, atoms transfer or share electrons to obtain outer shells with eight electrons.
