Anyone
who has ever had to share something with someone else knows that
sometimes isn't exactly even. Covalent molecules or bonds are no
different.
If
a molecules is nonpolar covalent, it is sharing its electrons equally.
The best example of this is in diatomic molecules. Diatomic molecules
are two of the same atom bonded together - so they would have exactly
the same pull. Symmetrical molecules are also nonpolar.
Polar
covalent bonds occur when electrons are not equally shared. One atom,
usually more electronegative, has a stronger pull on the electrons and
shares them unequally. The other atom that is less electronegative has a
smaller hold on the electrons and is thus can be slightly positive.
One way to remember this is... "Polar Bears do not share... equally."
No comments:
Post a Comment