The atomic radii of Iron (), Cobalt (), and Nickel () in the middle of the 3d series are virtually identical. What is the fundamental quantum mechanical explanation for this plateau?

Question

The atomic radii of Iron ($Fe$), Cobalt ($Co$), and Nickel ($Ni$) in the middle of the 3d series are virtually identical. What is the fundamental quantum mechanical explanation for this plateau?

Prashant Kotian · Accepted Answer

Correct answer: B. Atomic size is a tug-of-war between Effective Nuclear Charge (ENC) pulling inward and interelectronic shielding pushing outward. In the middle of the series, the inward pull of added protons is perfectly neutralized by the outward push of the added shielding electrons.

💡 Solution & Explanation

Practice 22,000+ questions like this