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\documentclass[11pt]{article}
\usepackage{german}
\newlength{\fdxvi}
\newlength{\fdxvii}
\newlength{\fdxiv}
\newfont{\elvsy}{cmsy10 scaled 1095}
\newcommand{\chemical}[1]{%
\fdxiv=\fontdimen14\elvsy%
\fdxvi=\fontdimen16\elvsy \fdxvii=\fontdimen17\elvsy%
$\fontdimen14\elvsy=5pt \fontdimen16\elvsy=3.3pt \fontdimen17\elvsy=3.3pt
\mathrm{#1}$
\fontdimen14\elvsy=\fdxiv
\fontdimen16\elvsy=\fdxvi \fontdimen17\elvsy=\fdxvii}
\begin{document}
\chemical{Fe_2^{+2}Cr_2O_4}
\end{document}
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