
 Bonds (Site not responding. Last check: 20071025) 
  In the second sigma bonding case, the p orbital can reach out to the s orbital, but the overlap is smaller because the s orbital cannot reach out to the p orbital. 
  For example, in the fully antibonding orbital, N = 5, therefore the number of nodes should be 4, which there is. There is also one more type of molecular orbital, the nonbonding type, and plays no role in bonding. 
  The larger B is, the better the overlap and the greater the separation between the bonding and antibonding orbitals. 
 www.chembio.uoguelph.ca /educmat/chm729/band/bond.htm (674 words) 
