CHEM-UA 126 Study Guide - Final Guide: Pi Bond, Electrochemistry, Trigonal Planar Molecular Geometry
24 Jun 2015
School
Department
Course
Professor
Document Summary
Lewis symbols: used in molecular bonding & structure. Valence electrons: electrons which are in outermost shell of atoms. Responsible for bonding that results w/n any chemical species. Electronegativity: ability of bonded atom to attract electrons. Largest difference in electronegativity b/w atoms transfer of electron from metal to. Small difference in electronegativity b/w atoms electrons aren"t shared or transferred nonmetal ionic bond covalent bond. Octet rules: atoms tend to lose, gain, or share electrons to achieve an outer shell of 8 electrons. Makes atom isoelectronic w/ nearest noble gas. Exceptions to octet rule: h, he (has stable outer shell of just 2 electrons) Count number of valence electrons on constituent atoms. Sketch skeletal structure of molecule or polyatomic ion, central atom is usually one with lowest electronegativity, largest size, or highest valence. Distribute valence electrons on outer atoms by placing 8 electrons on each (except h which gets 2 electrons)
