mhchem for MathJax, 3.3

mhchem for MathJax is a 3rd-party extension for MathJax, for typesetting chemical equations.

Usage

\ce{CO2 + C -> 2 CO}

Manual

The manual (including a live test drive)

Using cdnjs

For information on how to load the extension and make the \ce command available, see the official MathJax docs. In short, use this config:

MathJax.Ajax.config.path["mhchem"] =
  "https://cdnjs.cloudflare.com/ajax/libs/mathjax-mhchem/3.3.2";
MathJax.Hub.Config({
  TeX: {
    extensions: ["[mhchem]/mhchem.js"]
  }
});

Changes of v3.0.x (when compared to v2.6.0 "legacy: true")

• Complete rewrite of syntax parser
• Staggered layout for charges (IUPAC style)
• Improved spacing and space handling: 1/2 X^{2-} v, $n-1$ H^3HO(g), ^{22,98}_{11}Na, ...
• Decimal amounts: 0.5 H2O, 0,5 H2O
• Advanced charge/bond/hyphen distinction: OH-(aq), \mu-Cl, -H- ...
• Decimal and negative superscripts/subscripts: ^0_-1n-, ^{22.98}_{11}Na
• Superscript electrons: OCO^{.-}
• IUPAC fraction style: (1/2)H2O
• Auto-italic variables: n H2O, nH2O, NO_x, but pH
• Improved scanning: Fe^n+, X_\alpha, NO_$x$, $\alpha$$a$, ...
• Some unicode input, e.g. arrows
• {text} text escape
• \bond{3}
• Arrow arguments now parsed as \ce: A ->[H2O] B, A ->[$x$] B
• <--> arrow
• More opeators: A + B = C - D, \pm
• Recursion works (\ce inside \ce)
• Removed hardly used synonyms \cf, \cee and command \hyphen
• Excited state: X^*
• Ellipsis vs bond: A...A, B...B, ...
• Punctuation: , ;
• Dissociation constant: pKa
• Orbitals: sp^2, s^{0.5}p^3-N
• Kroeger-Vink notation
• Better-looking Fast-HTML rendering: \ce{A + _{a}X}
• Many other things
• Side-effects for non-standard input