sentences:  The bond also strengthens and shortens as more fluorines are added to the same carbon on a chemical compound.As such, fluoroalkanes like tetrafluoromethane (carbon tetrafluoride) are some of the most unreactive organic compounds.The high electronegativity of fluorine (4.0 for fluorine vs. 2.5 for carbon) gives the carbon–fluorine bond a significant polarity/dipole moment.