Polarity
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Re: Polarity
You would know based on the electronegativity of the elements by using the periodic trends and also by formal charges because a negative formal charge would mean the electron density his higher around that atom.
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Re: Polarity
You can compare the electronegativity of the elements using the periodic table- there will be a greater electron density around the element with a higher electronegativity.
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Re: Polarity
If you see that all the dipole forces cancels out, then the molecule is nonpolar. However, if there is a net dipole moment that's not zero, then you can tell that the molecule is polar.
Re: Polarity
Also, if the Lewis Structure contains all the same elements then the molecule is nonpolar, but if there is just one difference it can be polar.
For example, if there are 4 Cl attached to a centered Cl, that would have polar bonds but be a nonpolar molecule. But if there are 4 Cl attached to a centered C, that would have polar bonds and be a polar molecule.
It all really depends on the number of polar bonds--if there is an equal number of polar bonds, it's not polar, but if there is an inequality of polar bonds, it's polar.
For example, if there are 4 Cl attached to a centered Cl, that would have polar bonds but be a nonpolar molecule. But if there are 4 Cl attached to a centered C, that would have polar bonds and be a polar molecule.
It all really depends on the number of polar bonds--if there is an equal number of polar bonds, it's not polar, but if there is an inequality of polar bonds, it's polar.
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