CHEM101 Lecture Notes - Diamagnetism, Quadruple Bond, Lone Pair

• School: University of Alberta
• Department: Chemistry
• Course: CHEM101
• Professor: Yoram Apelblat

Document Summary

Antibonding = : mo, one, two, paramagnetic: attracted by a magnet where some electrons are unpaired, diamagnetic: all electrons are paired, no magnetic attraction, bond order (bo) = (#bonding electrons # antibonding electrons)/2, bo>0 = stable. P*: 4 lobes pointing away from 2 nuclei, zero probability in between: nve = 2(4) = 8 electrons, no evidence of this in nature therefore must try another arrangement, c c triple bond with one having a lone pair = no octets, c c triple bond with each having one lone electron = no octets, none of the proposed structures are satisfactory. + means 1 electron has been removed: for h2 we get 2 electrons in 1s, h2, when drawing: 1s now only has 1 electron, h2, when drawing: 1s has 2 electrons and 1s* has one electron (antibonding, bond orders for h2 = 2 2/2=1.