Template talk:Chem2

Additional abbreviations

Please add these fairly common abbreviations:

• Me = 'Methyl group',
• Bu = 'Butyl group',
• Pn = 'Pentyl group',
• Cp = 'Cyclopentadienyl',

Looking at Skeletal formula or other list, it's hard to say which other abbreviations should definitely be added. Many are rare. Many clash with atoms (Ac is actinium, so no acetyl. Pr is praseodymium, so no propyl.) -A876 (talk) 23:08, 3 December 2024 (UTC)

 Done Primefac (talk) 14:40, 25 December 2024 (UTC)

Copernicium named Cp not Cn?

Hey, I'm translating the module into Icelandic and I noticed that Copernicium, element 112 is as Cp and not Cn in the module, see this image:

I'm putting it as Cn in the Icelandic translation since that's the correct one according to the wikipedia page on copernicium, https://en.wikipedia.org/wiki/Copernicium. Would be cool if somebody would fix this on here also, I can't because of the protection. Thanks :) Huldar98 (talk) 00:02, 18 December 2024 (UTC)

Please change (in module:chem2):

	Cp = "Copernicium",

to

	Cn = "Copernicium",

per last comment and copernicium. Christian75 (talk) 02:33, 26 December 2024 (UTC)

 Completed. P.I. Ellsworth , ed. ^{put'er there} 04:49, 26 December 2024 (UTC)

We need to get rid of <br>

Is there a way to get rid of <br> in this template?

1. It interferes with selecting text using three clicks; see the screenshot from Nitrate#Dietary nitrate:

   

2. The copied text becomes

   A source of nitrate in the human diets arises from the consumption of leafy green foods, such as spinach and arugula. NO−
   3 can be present in beetroot juice.

   I'm not sure what would be the preferred form of the text when copied (probably a special syntax like LaTeX in math templates), but "NO−[line break]3" makes no sense.

The same applies to {{chem}}. Jack who built the house (talk) 09:16, 11 April 2025 (UTC)

An issue with hapticity and mu

The μ₂- (\m{2}) should link to bridging ligand with auto=yes.

Besides that, hapticity and mu do not properly link when placed in linking code, like hapticity and every symbol listed in Template:Chem2/doc#All_recognised_symbols_and_codes, and hapticity should link only once:

• {{chem2|(\h{5}Cp)FeCO(\m{2}CO)FeCO(\h{5}Cp)}} → (η⁵-Cp)FeCO(μ₂-CO)FeCO(η⁵-Cp)
• {{chem2|(\h{5}Cp)FeCO(\m{2}CO)FeCO(\h{5}Cp)|auto=yes}} → (η⁵-Cp)FeCO(μ₂-CO)FeCO(η⁵-Cp)
• {{chem2|([[\h{5}]]Cp)FeCO([[\m{2}]]CO)FeCO(\h{5}Cp)}} → ([[\h{5}|η⁵-]]Cp)FeCO([[\m{2}|μ₂-]]CO)FeCO(η⁵-Cp)
• {{chem2|([[Hapticity|\h{5}]]Cp)FeCO([[Bridging ligand|\m{2}]]CO)FeCO(\h{5}Cp)}} → (η⁵-Cp)FeCO(μ₂-CO)FeCO(η⁵-Cp)

–LaundryPizza03 (dc̄) 06:46, 5 December 2025 (UTC)

Fractions

There's a bug/feature that causes fractional coefficients to be displayed improperly. For example, this was in Bombardier beetle:

H₂O₂(aq) → H₂O(l) + 1/₂O₂(g)

By splitting it into two chem2 templates and a frac2, I changed that line to:

H₂O₂(aq) → H₂O(l) + ⁠1/2⁠O₂(g)

I wanted to get some feedback before I bother to fix other pages. AndyBloch (talk) 03:56, 10 January 2026 (UTC)

Seconding this. Is there a way to do a "Feature request"? I'd like native support for fractions to be added in here without having to split things or use hacks like ^{3}/_{2}. ~2026-34298-51 (talk) 19:21, 10 June 2026 (UTC)