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Their is no electronegativity difference between two atoms of chlorine, but there is a big enough difference between chlorine and hydrogen to have the electron of hydrogen spend more time in the orbital of chlorine than in the hydrogen orbital, thus this molecule is slightly charged on either end (+/-) and therefore polar covalent.

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βˆ™ 2012-08-11 02:54:43
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Q: Why Cl2 has a nonpolar covalent bond while HCl has a polar covalent bond?
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