How is it that in Schomaker and Stevenson's formula for atomic radii in case of covalent bond subtracts electonegativity (k cal/mol) from radius (angstrom) ???


 

1. The actual bond length of a covalent bond is very different from the calculated value of the bond length.

2. This happens because, when two atoms of different elements combine to form a covalent bond, their respective electronegativities effect the dimension of the bond length as the more electronegative atom pulls the less electronegative atom towards it and the distance between them is reduced.

3. Thus, we calculate the net effect of electronegativity of the bond, and then subtract it to get original value.

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