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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: xxgunnerxx on January 27, 2009, 12:59:34 PM

Title: Interpreting Dumbell Diagrams
Post by: xxgunnerxx on January 27, 2009, 12:59:34 PM

Hi I seem to have a problem interpreting dumbell diagrams based on lowest to highest in energy or vice versa. For example, in this picture (lowest energy -1 highest -5) the correct asnwer is 3,2,1,4,5 (from the top).
(https://www.chemicalforums.com/proxy.php?request=http%3A%2F%2Fimg204.imageshack.us%2Fimg204%2F7540%2Fdsc00031ps2.jpg&hash=e05f13cac0c1d4007af14d3ec624714631167a69) (http://img204.imageshack.us/my.php?image=dsc00031ps2.jpg)
(https://www.chemicalforums.com/proxy.php?request=http%3A%2F%2Fimg204.imageshack.us%2Fimg204%2Fdsc00031ps2.jpg%2F1%2Fw1280.png&hash=8e59477d7df4bcfc3bd1d4693834de7a69c3ac24) (http://g.imageshack.us/img204/dsc00031ps2.jpg/1/)
I understand that the dumbbells are P orbitals and if two are black on either side then they are constructively interacting, else there is antibonding (destructive) interaction, therefore higher in energy (less stable) compared to constructive interacting. So then how can I use that theory to solve these diagrams? I guess the middle figure would make sense since there is no antibonding but what happens when you have 3/4 dumbells?

Thanks.

Title: Re: Interpreting Dumbell Diagrams
Post by: xxgunnerxx on January 30, 2009, 01:48:13 PM

any one? ???