Correct expression of "Allred and Rochow's" scale is : — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

Step 1: On the Allred-Rochow scale, electronegativity is defined in terms of the electrostatic force exerted by the effective nuclear charge on valence electrons at the covalent boundary. Step 2: This electrostatic force is proportional to Z_eff / r^2, where r is the covalent radius of the atom. Step 3: To align these values with Pauling's electronegativity values, the formula is empirically written as: Electronegativity = 0.359 * (Z_eff / r^2) + 0.744. This matches option (d).