Electronegativity of hydrogen

Answer According to Table 1.3, the electronegativity of hydrogen is 2.20 and that of fluorine 3.98. Putting these values into Eq. (1.8) gives... 

Calculate the electronegativity of hydrogen from (he ionization potential and the electron affinity. 

The electronegativity of hydrogen is 2.1, and that of fluorine is 4.0 (see Table 6-3). Clearly, the F atom, with its higher electronegativity, attracts the shared electron pair much more strongly than does the H atom. We can represent the structure of HF as shown in the margin. The electron density is distorted in the direction of the more electronegative F atom. This small shift of electron density leaves H somewhat positive. 

You need not memorize these values, but you should know the trends, the extremes, and that the electronegativity of hydrogen is about the same as boron, H (2.1), B (2.0). 

Then, too, in keeping with the different electronegativities of hydrogen and the helium cation, we expect and find that for the converged results, the bonding molecular orbital... 

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