Template:Chem/doc

This template allows you to render chemical formulas using HTML.

Alternatively, you can use <chem>...</chem>, using mhchem LaTeX notation to generate formulas, however this is discouraged by MOS:NOCHEMTAG.

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. The Chem2 template can be used for e.g. ²H₂¹⁶O, 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:

{{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, "CH<sub>2</sub>=CH<sub>2</sub>" 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

• {{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