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\documentclass[12pt]{article}
\usepackage{german}
\newlength{\fdxvi}
\newlength{\fdxvii}
\newlength{\fdxiv}
\newfont{\twlsy}{cmsy10 scaled 1095}
\newcommand{\chemical}[1]{%
   \fdxiv=\fontdimen14\twlsy%
   \fdxvi=\fontdimen16\twlsy \fdxvii=\fontdimen17\twlsy%
   $\fontdimen14\twlsy=5.5pt \fontdimen16\twlsy=3.6pt \fontdimen17\twlsy=3.6pt
    \mathrm{#1}$
    \fontdimen14\twlsy=\fdxiv 
    \fontdimen16\twlsy=\fdxvi \fontdimen17\twlsy=\fdxvii}
\begin{document}
\chemical{Fe_2^{+2}Cr_2O_4}
\end{document}