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Find the electronegativity of lead with ...

Find the electronegativity of lead with the help of the given valus. Screening consitant `(sigma)` of `Pb = 76.70`. Atomic number of lead `= 82` and covalent radius of `Pb = 5.3 Å`

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Substituting the value of `sigma`, `Z` and `r` in Allered-Rochow's scale …(i)
`Z_("eff") = Z - sigma = 82-76.70 = 5.3`
`chi_(Pb) = 0.359 xx (Z_("eff"))/(r^(2)) + 0.744`
`= 0.359 xx (5.3)/((5.3)^(2)) + 0.744`
`= 1.55`
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