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Polar and Nonpolar Bonds

In polar molecules, one end of the molecule has a slightly more negative charge and the other is slightly positive. This is because one of the atoms has a higher electronegativity and attracts the electrons of the other atom.
In nonpolar molecules, the electrons are shared equally and neither end has a charge. Nonpolar molecules often have a more linear shape than polar molecules.
Both polar and nonpolar molecules have covalent bonds, which means electrons are shared in order to complete the valence shell of electrons.