How To Determine Ionic Character

ii. Pauling introduced the idea of defining the pct ionic graphic symbol possessed by a chemical bond. A covalent bail with equal sharing of the charge density has 0% ionic character, and a perfect ionic bond would of class have 100% ionic graphic symbol. One method of estimating the pct ionic character is to set it equal to the ratio of the observed dipole moment to the value of eR, all multiplied by 100.

The value of eR is, information technology will exist recalled, the value of the dipole moment when 1 charge is completely transferred in the formation of the bond and the resulting ions are spherical.

      Use this method to determine the pct ionic grapheme of the bonds in the diatomic hydrides, LiH to HF. Could any existent molecule ever showroom 100% ionic graphic symbol co-ordinate to this definition?

3. Pauling has proposed an empirical relationship which relates the pct ionic character in a bail to the electronegativity difference.

From the electronegativity values given in Table 7-two, it is seen that the difference (c _F - c _H ) is greater than the value (c _H - c _Li ). Using the above relationship, we can calculate that the bail in HF should be 59% ionic while that in LiH should be only 26% ionic. Does the guess of the relative ionic character in HF and LiH based on the electronegativity deviation concur with that obtained by a comparison of the molecular charge density and density difference maps for these 2 molecules?

How To Determine Ionic Character,

Source: https://www.chemistry.mcmaster.ca/esam/Chapter_7/problems.html

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