How many of the following elements are strictly NOT considered typical transition metals according t — d and f Block Elements Chemistry Question

💡 Solution & Explanation

A transition element is defined as having partially filled $d$ -orbitals in its neutral state or any common oxidation state. $Zn$, $Cd$, and $Hg$ (Group 12) have a completely filled $d^{10}$ configuration in their neutral state ($ns^2 (n-1)d^{10}$) and their typical $+2$ state ($(n-1)d^{10}$). Thus, these $3$ elements are technically excluded from being typical transition metals. $Cu$ is included because its $+2$ state is $3d^9$.