Question

Explain Pauling 's scale of electronegativity ?

Answer 1

Answer:

Pauling scale is a numerical scale of electronegativities based on bond-energy calculations for different elements joined by covalent bonds. ... Fluorine (the most electronegative element) is assigned a value of 4.0, and values range down to cesium and francium which are the least electronegativeat 0.7.

Answer 2

Pauling's scale of electronegativity : This scale is based on excess bond engines.It is observed that the energy of a heteropolar bond A - B is generally greater then the average arithmetic mean of the homopolar bond energies for A - A and B - B type bonds.

$\large\qquad \quad \underline\bold{ \pink{\sf\: E_{A-B} =\dfrac{1}{2}[E_{A-A}+E_{B-B}]+\triangle_{AB}} }\qquad$

The excess bond energy $\sf \: \triangle_{AB}$is related to electronegativities of elements A and B $\sf \: (χ_A \: \: and \: \: χ_B)$as

$\qquad \qquad\underline{ \boxed{ \red{ \pmb{\: χ_A- χ_B = 0•208 \sqrt{ \triangle_{AB}}}}}}$

Arbitrary value of electronegativity is assigned to one of the elements and electronegativity of hydrogen was Arbitrary taken as 2•1. Fluorine is the most electronegative element and its electronegativity is 4 in pauling's scale.