Which of the following elements strictly possess exactly one electron in their outermost -orbital () — d and f Block Elements Chemistry Question

💡 Solution & Explanation

Chromium ($Cr$) is $3d^5 4s^1$, Copper ($Cu$) is $3d^{10} 4s^1$, and Silver ($Ag$) is $4d^{10} 5s^1$. These anomalies occur to achieve half-filled or fully filled $d$ -orbital stability. Palladium ($Pd$) is anomalous as well, but its configuration is $4d^{10} 5s^0$, meaning it has zero electrons in its outermost $s$ -orbital.