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How can mathjax be used with \ce to show reaction conditions and catalysts on the arrow?

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$\ce{LiK + e- ->[this?]}$

Use square brackets immediately after the arrow. Eg $\ce{ A ->[above][below] B}$ gives $\ce{ A ->[above][below] B}$. You may omit the brackets for the below-arrow bit if you wish.

There's more info on this and all other mhchem features in the documentation

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  • $\begingroup$ Do you how to enable mchem on sites (e.g. Mathematica.SE) that don't have it installed by default? \usepackage doesn't seem to work. I've seen the solution somewhere but figured it was such an easy thing to remember I wouldn't have to bookmark it.....ugh. $\endgroup$ Aug 19 '13 at 13:49
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    $\begingroup$ @bobthechemist \require{mhchem} should work for a single page (Other extensions can be used this way too). Otherwise you can make a meta post for it to be enabled on all pages for the site if you have a good enough case for it. $\endgroup$ Aug 19 '13 at 14:43
  • $\begingroup$ @ManishEarth Offtopic but, is $\ce{LiK}$ a real compound? I head diatomic species like $\ce{Li2}$ and $\ce{K2}$ exist and are explained by MOT, so why not $\ce{LiK}$? $\endgroup$ Jun 9 '17 at 1:45

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