Using Allred-Rochow equation, calculate the electronegativity of Zn atom from the following dataCovalent radius of Zn=1.25A∘, at. no., Z=30 and screening constant, σ=25.65.

According to Allred-Rochow :Electronegative (x) ofZn=0.359×Zeffr2 in A∘+0.744where Zeff =( At. no., Z)−( Screening constant, σ)=30−25.65=4.35Substituting the values in (1), we get: Electronegativity of Zn =0.359×4.35(1.25)2+0.744=0.999+0.744=1.743