Chy102-Lecture 09 - 16/01/2008 General Chemistry Chem102...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
1 8 th lecture General Chemistry Chem102 for Engineering 16/01/2008
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 Objectives Valence Bond (VB) Theory and orbital hybridization Basic Principle of Valence Bond Theory Opposing spins of the electron pair Maximum overlap of bonding orbitals Hybridization of atomic orbitals. Types of hybrid orbitals sp Hybridization sp 2 Hybridization sp 3 Hybridization sp 3 d Hybridization sp 3 d 2 Hybridization End-to-end (head to head) overlap and sigma ( σ ) bonding Side to side (lateral) overlap and pi ( π ) bonding
Background image of page 2
3 Valence Bond (VB) Theory and orbital hybridization 1. Opposing spins of the electron pair. The region of space formed by the overlapping orbitals has a maximum capacity of two electrons that must have opposite spins. Basic Principle of Valence Bond Theory A covalent bond forms when the orbitals from two atoms overlap and a pair of electrons occupies the region between the nuclei. What is covalent bond, and what characteristics give it strength? Most importantly, how can we explain the molecular shapes we see based on the interactions of atomic orbitals? The most useful approach for answering these questions is Valence Bond (VB) Theory Central Themes of Valence Bond Theory H H
Background image of page 3

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

View Full DocumentRight Arrow Icon
4 1. Maximum overlap of bonding orbitals . The bond strength depends on the attraction of nuclei for the shared electrons, so the greater the orbital overlap, the stronger (more stable) the bond. To maximize overlap, in case of HF, H 1s and F 2p orbitals overlap along the long axis of 2p orbital involved in bonding. Similarly, in the F
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 17

Chy102-Lecture 09 - 16/01/2008 General Chemistry Chem102...

This preview shows document pages 1 - 5. Sign up to view the full document.

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