# Down arrow with many lines using mhchem package

I am using mhchem package for a chemistry chapter in my document. I have a section in which there is a down arrow with many lines, as shown in image below.

The code for this that I've wrote so far is like this;

\documentclass[10pt,a4paper]{report}
\usepackage [version=4] {mhchem}
\usepackage[left=2cm,right=2cm,top=2cm,bottom=2cm]{geometry}

\begin{document}
\noindent
\ce{Al}\\
\ce{Mg}\\
\ce{Zn}\\
\ce{Fe}\\
\ce{Pb}\\
\ce{Cu}\\

\end{document}


Please tell me that how can I do this. Thanks!

You could exploit \downarrow that's extensible:

\documentclass[10pt,a4paper]{report}
\usepackage [version=4] {mhchem}
\usepackage[left=2cm,right=2cm,top=2cm,bottom=2cm]{geometry}

\begin{document}

\noindent
$\left\downarrow \begin{tabular}{l@{\qquad}l@{}} \ce{Mg} & strongest reducing agent, more readily becomes oxidized\\ \ce{Al}\\ \ce{Mg}\\ \ce{Zn}\\ \ce{Fe}\\ \ce{Pb}\\ \ce{Cu}\\ \ce{Ag} & weakest reducing agent, least readily becomes oxidized \end{tabular} \right.$

\end{document}