PPT Slide

32

• If the surrounding atoms or the electron groups are not identical,  nonideal bond angles occur.

Consider formaldehyde (CH 2O):

• The four electrons in the double bond repel the two electrons in  the two single bonds more strongly than they repel each other.

• Only atom positions define a shape; if one  of the three electron groups is a lone pair  (AX 2E), the molecule is bent.

• A lone pair repels bonding pairs more strongly  than bonding pairs repel each other.

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