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).

{{chem|C|''n''|H|2''n'' + 2}}

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.

See also {{Nuclide2}}

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:

{{chem|[[Hydrogen|H]]|2|[[Oxygen|O]]}} 

gives

H
₂O

Notes

• To include "=" in the formula, use "=" For example, "{{chem|CH|2|=CH|2}}" yields CH
  ₂=CH
  ₂.
  • Or, don't use this template. For example, "CH₂=CH₂" yields CH₂=CH₂.
• To include "≡" in the formula, use "≡" For example, "{{chem|HC≡CH}}" yields HC≡CH.
• The template accepts up to twenty parameters in addition to link.
• This template uses {{su}}.

See also

• {{Chemical formula}}, which auto-links elements and common compounds
• {{Chem2}}
• {{Chem molar mass}}

TemplateData

This is the TemplateData documentation for this template used by VisualEditor and other tools; see the monthly parameter usage report for this template.

TemplateData for Chem

Template data

<templatedata> { "params": { "1": {}, "2": {}, "3": {}, "4": {}, "5": {}, "6": {}, "7": {}, "8": {}, "9": {}, "10": {}, "11": {}, "12": {}, "13": {}, "14": {}, "15": {}, "16": {}, "17": {}, "18": {}, "19": {}, "20": {}, "21": {}, "22": {}, "23": {}, "24": {}, "link": { "label": "Link", "description": "Make the formula link to an article", "example": "Water", "type": "wiki-page-name" } }, "description": "Render chemical formulas using HTML. Alternatively, you can use <chem>...</chem>, using mhchem LaTeX notation to generate formulas.\n\nUp to 25 unnamed ordered parameters can be used with automatic detection of subscripts and superscripts.", "format": "inline", "paramOrder": [ "link", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24" ] } </templatedata>

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