Question

# Covalent radius of F is 0.72 A$$^o$$. Calculate its Allred-Rochow's electronegativity to nearest integer

Solution

## The Allred-Rochow electronegativity formula is $$\chi = \dfrac {0.359Z}{r^2}+0.744$$Here, $$Z$$ is the effective nuclear charge and $$r$$ is the atomic radius.Substitute values in the above expression.$$\chi = \dfrac {0.359 \times 5.2}{0.72^2}+0.744=4.345$$Hence, the electronegativity of fluorine on the Allred-Rochow scale is $$4.345.$$So, the correct answer is 4.Physics

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