\[
\begin{align_}
\text{a. Copper} & : \boxed{\text{Cu}} \\
\text{b. Platinum} & : \boxed{\text{Pt}} \\
\text{c. Calcium} & : \boxed{\text{Ca}} \\
\text{d. Manganese} & : \boxed{\text{Mn}} \\
\text{e. Iron} & : \boxed{\text{Fe}} \\
\text{f. Barium} & : \boxed{\text{Ba}} \\
\text{g. Lead} & : \boxed{\text{Pb}} \\
\text{h. Strontium} & : \boxed{\text{Sr}} \\
\end{align_}
\]