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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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