Template:Chem/doc

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

Template instructions

This template, {{chem}}, serves to simplify the writing of chemical formulae. 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

TemplateData

This is the TemplateData for this template used by TemplateWizard, VisualEditor and other tools. Click here to see a monthly parameter usage report for this template in articles based on this TemplateData.

TemplateData for Chem

Render chemical formula's using HTML. Alternatively, you can use <chem>...</chem>, using mhchem LaTeX notation to generate formulae. 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