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This has to do with the actual shape of CF4. Cf4 takes the shap of a carbon surrounded by 4 flourines. The 4 flourines are evenly spaced and opposite of eachother.

Each florine is more electrongative than the carbon and tend to attract electrons more than the carbom giving the florines a negative charge. In most situations this would lead to the molecule being polar but remember! The florines are opposite of eachother. Since all of the florines are negatively charged, and there are florines are on all sides of the carbon, all sides of the carbon are equally negatively charged leading to the molecule being non polar.

Though, the molecule has positive and negative atoms the negative atoms aren't all on one side meaning that their are no definite poles.

Basically, the Molecule is force canceling.

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Q: How can a molecule such as CF4 have an electronegativity difference greater than or equal to 0.4 and still be considered non-polar?
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