Question

The screening effect of $d$-electrons is

• A. Equal to p-electrons
• B. Much more than p-electrons
• C. Same as f-electrons
• D. Less than p-electrons.

Answer 1

Answer: (D)

The screening effect of $d$ - electrons is less than $p$ - electrons. In general, $d$ and $f$ electrons have a poor shielding effect compared to s and $p$ electrons. This is because s and $p$ electrons are close to the nucleus whereas $d$ and $f$ electrons are more diffused (away from the nucleus).