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I noticed in one of my answers to a question about excitation of electrons that the term $\ce{CH4}$ was used. I remember seeing it before in the Markdown editing page for Chemistry Stack Exchange.

But now, when I bring up my browser to that editing page and I search with my web browser for "ce", there aren't any instances found on that page. Where did the explanation of this option go?

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You're probably thinking of the Chemistry MathJax FAQ

That contains the (rather similar) MathJax expression for water

The chemical formula of water is $\ce{H2O}$.

It's linked from the page you listed via

Learn more: MathJax help.

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    From what I understand, this link is customizable by site but the rest of the page isn't.
    – Laurel
    Commented Jun 15, 2023 at 11:56
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    I was noticing that chemistry.stackexchange.com/editing-help#comment-formatting that is the main link on to how to format comments, that this information seems to be missing. It seems quite essential for chemical formatting so I think that your referenced example should be shown directly there without having to navigate elsewhere, if I understand you correctly. For me, I have your good answer in my in-box so it is no long a problem. But, for others, I think that the example you give should be in the direct link also.
    – Stephen Elliott
    Commented Jun 15, 2023 at 13:48
  • I did see the additional MathJax help link from there, and indeed that is very helpful. Thank you for your navigational assistance. To get there is not to hard for me to memorize now.
    – Stephen Elliott
    Commented Jun 18, 2023 at 13:00
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The root help page on Chemistry now has an example of chemistry markup and a link to the relevant post:

enter image description here

For your convenience, here is the URL the link points to: FAQ: How can I format math/chemistry expressions on Chemistry Stack Exchange?

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    (And for others' reference: Site mods can edit the top section of the main Help Center page on their own site. Karsten is a Chemistry.SE mod.)
    – V2Blast
    Commented Jun 15, 2023 at 16:20
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    @V2Blast Yes, unless they are on strike ;-)
    – Karsten
    Commented Jun 15, 2023 at 18:10

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