Template:Chem/doc

Template instructions

This template serves to simplify the writing of chemical formulae. For example,

{{chem|H|2|O}}

will yield:

H₂O

Algebraic expression as subscript

Algebraic expression 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 are also supported:

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

yields:

H₃O⁺

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

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

gives:

SO2−4

Atomic number and mass number

The first parameter can be used for mass number.

{{chem|4|He}}

gives:

⁴He

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

{{chem|4|2|He}}

gives:

42He

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.

Linking

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

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

will yield:

H₂O

For linking individual elements can be linked in the following manner.

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

gives

H₂O

Notes

• To include "=" in the formula, use "=" For example, "{{chem|CH|2|=CH|2}}" yields CH₂=CH₂.

• The template accepts up to twenty parameters in addition to link.
• This template uses {{su}}.