CH301 - chapter 9 notes

CH301 - chapter 9 notes - 1 CH 301 Chapter 9 Molecular...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1 CH 301 Chapter 9 Molecular Orbitals in Chemical Bonding The diatomic molecule of O 2 has the following Lewis structure: •• •• O = O •• •• The molecular geometric shape indicates that the molecule has a double bond and each oxygen atom has two unshared pairs of electrons around the central atom. Since there are no half-filled orbitals (unpaired electrons), it would be expected that the molecule, when placed in a magnetic field, would be diamagnetic. However, experimental procedures show that the molecule is paramagnetic. Therefore, the valence bond theory is not an acceptable explanation for the bonding that occurs in the oxygen molecule. Diamagnetic substances are those substances in which all the electrons are paired and are weakly repelled by magnetic fields. Paramagnetic substances are those substances that contain unpaired electrons and are weakly attracted into magnetic fields. Molecular orbitals is a bonding theory that explains the phenomenon of the paramagnetic behavior of molecular oxygen by rationalization that O 2 has two unpaired electrons. Molecular Orbitals: Combination of atomic orbitals on different atoms forms molecular orbitals (MO’s) so that electrons in MO’s belong to the molecule as a whole.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 06/19/2008 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas at Austin.

Page1 / 6

CH301 - chapter 9 notes - 1 CH 301 Chapter 9 Molecular...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online