CHE 1301 Chapter 8: Chapter 8 textbook notes
18 Jan 2016
School
Department
Course
Professor
Document Summary
Direction of arrow in orbital diagram symbolizes electron spin. Basic property like negative charge, and is quantized. Pauli exclusion principle: each orbital can only have max of 2 electrons with opposing spins. Unpaired electron has its own magnetic spin. Further away you go, the more energy you have and more shielded you. Electrons want to fill lowest energy orbital sequence possible. Aufbau: electrons fill lowest energy orbitals first. Hund"s: one arrow in each orbital, then pair up. No hun"s on the train in main-group elements, valence electrons are in outermost principal. Nrg level (n=4 or 3 or 2 or 1). In transition elements, count d electrons along with valence. Ex: si (silicone) has 4 valence e"s. e config is 1s2, 2s2, 2p6, 3s2, 3p2. Outermost n=3. (page 326 is v good explanation) exists! Look @ top of periodic table numbers. increased size. 4s orbital lower in nrg than 3d, therefore fills first although n is less.
