Potassium fluoride electronegativity

C—H bonds are relatively nonpolar, because carbon and hydrogen have similar electronegativities (electronegativity difference = 0.4 see Table 1.3) N—H bonds are more polar (electronegativity difference = 0.9), but not as polar as O—H bonds (electronegativity difference = 1.4). Even closer to the ionic end of the continuum is the bond between sodium and chloride ions (electronegativity difference = 2.1), but sodium chloride is not as ionic as potassium fluoride (electronegativity difference = 3.2). 

How can the electronegativity difference help you predict the type of bond By the end of this section, you will understand the aswer to this question. Consider three different substances potassium fluoride, KF, oxygen, O2, and hydrochloric acid, HC1. Potassium fluoride is an ionic compound made up of a metal and a non-metal that have very different electronegativities. Potassium s electronegativity is 0.82. Fluorine s electronegativity is 3.98. Therefore, AEN for the bond between potassium and fluorine is 3.16. 

Fluorine has the strongest electronegativity and is the strongest oxidizing element on the whole periodic table. Fluorine is found naturally in the mineral fluorspar (CaF2) and the mineral fluorapatite (Ca5(PO )2F). Fluorine is chiefly prepared by electrolysis of potassium fluoride that is first dissolved in anhydrous hydrogen fluoride. 

The electronegativity differences in lithium fluoride, sodium chloride, and potassium bromide show that they are best represented as ionic compounds. 

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