Template:Chem

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This template allows you to render chemical formulas using HTML. Alternatively, you can use <chem>...</chem>, using mhchem LaTeX notation to generate formulas.

Template instructions

This template, {{chem}}, serves to simplify the writing of chemical formulas. For example,

{{chem|H|2|O}}

will yield:

H
₂O

Algebraic expression as subscript

Algebraic expressions are rendered as subscripts (but must not contain upper case letters). <syntaxhighlight lang="wikitext"> C
_nH
_2n+2 </syntaxhighlight> gives

C
_nH
_2n+2

Charge

Ion charge superscripts (for: +/-) are also supported:

{{chem|H|3|O|+}}

yields a "+" as superscript:

H
₃O⁺

Simultaneous subscripts/superscripts are automatically handled (use a hyphen for the minus sign):

{{chem|SO|4|2-}}

gives "2−" as superscript:

SO²⁻
₄

The hyphen is converted to a true minus sign.

Atomic number and mass number

The first parameter can be used for mass number.

{{chem|4|He}}

gives:

⁴
He

The first two parameters can be used for mass number and atomic number.

{{chem|4|2|He}}

gives:

⁴
₂He

Note

Only the first two parameters can handle two consecutive plain numbers (i.e. without a plus sign or a hyphen (+ or -) following). Otherwise the template will loop. The Chem2 template can be used for e.g. ¹H₂¹⁶O, heavy water.

See also {{Nuclide}}

Linking

The optional parameter link changes the formula into a link. For example:

{{chem|link=water|H|2|O}}

will yield:

H
₂O

Individual elements can be linked in the following manner: <syntaxhighlight lang="wikitext"> H
₂O </syntaxhighlight> gives

H
₂O

Notes

• To include "=" in the formula, use "&#61;" For example, "<syntaxhighlight lang="wikitext" inline>CH
  ₂=CH
  ₂</syntaxhighlight>" yields CH
  ₂=CH
  ₂.
  • Or, don't use this template. For example, "<syntaxhighlight lang="wikitext" inline>CH₂=CH₂</syntaxhighlight>" yields CH₂=CH₂.
• To include "≡" in the formula, use "&#8801;" For example, "<syntaxhighlight lang="wikitext" inline>HC&#8801;CH</syntaxhighlight>" yields HC≡CH.
• The template accepts up to twenty parameters in addition to link.
• This template uses {{su}}.

See also

• {{Chem2}}
• {{Chem molar mass}}

TemplateData

This is the TemplateData for this template used by TemplateWizard, VisualEditor and other tools. See a monthly parameter usage report for Template:Chem in articles based on its TemplateData.

TemplateData for Chem

Template data

Render chemical formulas using HTML. Alternatively, you can use <chem>...</chem>, using mhchem LaTeX notation to generate formulas. Up to 25 unnamed ordered parameters can be used with automatic detection of subscripts and superscripts. Template parameters This template prefers inline formatting of parameters. Parameter Description Type Status Link link Make the formula link to an article Example Water Page name optional 1 1 no description Unknown optional 2 2 no description Unknown optional 3 3 no description Unknown optional 4 4 no description Unknown optional 5 5 no description Unknown optional 6 6 no description Unknown optional 7 7 no description Unknown optional 8 8 no description Unknown optional 9 9 no description Unknown optional 10 10 no description Unknown optional 11 11 no description Unknown optional 12 12 no description Unknown optional 13 13 no description Unknown optional 14 14 no description Unknown optional 15 15 no description Unknown optional 16 16 no description Unknown optional 17 17 no description Unknown optional 18 18 no description Unknown optional 19 19 no description Unknown optional 20 20 no description Unknown optional 21 21 no description Unknown optional 22 22 no description Unknown optional 23 23 no description Unknown optional 24 24 no description Unknown optional

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