Math & Science ⇒ Index at left Side

[Ari]

How to make the left top index?

[localghost]

There are several approaches.

• Command \prescript from mathtools
• Package leftidx
• Package tensor

The respective manual has the details.


Best regards and welcome to the board
Thorsten

[Johannes_B]

In case you are trying to typeset chemical formulas, have a look at the chemmacros-package.

Code: Select all

\documentclass{article}
\usepackage{chemmacros}
\begin{document}
\ch{^{227}_{90}Th+}
\end{document}

Best regards
Johannes

[cgnieder]

This very much looks like a Russell-Saunders term symbol. I'd probably go with Johannes' proposal here:

Code: Select all

\documentclass{article}
% this is the package loaded by `chemmacros' internally
% (no need to load all the other features of the bundle):
\usepackage{chemformula}
\begin{document}
\ch{^1S0+}
\end{document}

rstermsymbol.png (5.92 KiB) Viewed 7333 times

Regards