Question

Covalent radius of oxygen is 0.74 A${}^o$ and its A.R. electronegativity is 3.5. What is effective nuclear charge experienced by oxygen?

(Round-off to the nearest integer).

Answer 1

The Allred-Rochow electronegativity formula is $\chi =\frac{0.359Z_{eff}}{r^2}+0.744$

Here, $Z_{eff}$ is the effective nuclear charge and r is the atomic radius.

Substitute values in the above expression.

$3.5=\frac{0.359\times Z_{eff}}{{0.74}^2}+0.744$

$Z_{eff}=4.2039$

Hence, the effective nuclear charge of oxygen is 4.2039.