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@David Condrey: recently added the following material to the article . I don't think I object to the addition in principle (although i haven't reviewed the material in full), but it's very poorly formatted at the moment, and brings the quality of this Featured Article down. I've included the material below, so it can be edited / tightened, and debated:
This article mentions Cavendish calling his discovery of hydrogen as "flammable air". Everywhere else that I've seen that talks about Cavendish and phlogiston theory, uses the term "inflammable air." 18.104.22.168 (talk) 16:45, 26 March 2015 (UTC)
inflammable is here , but following the usage notes here [] it is flammable to prevent confusion.Mion (talk) 18:09, 26 March 2015 (UTC)
In this context the article is describing the history of hydrogen specifically what Cavendish named his discovery. It seems to improper to change the words he used. The wikipedia page on Cavendish [] uses the term "inflammable air".22.214.171.124 (talk) 23:33, 31 March 2015 (UTC)
Hydrogen as element vs. hydrogen as molecule
This article is confusing, it mixes element, and molecule. I think it should be splited up like in Spanish wikipedia (Hidrógeno/Dihidrógeno), and other elements that are not found free (O,O2,O3). It would be hard to students get the difference if you put it in the same article and jump to one and to another without saying so.
Applies to H
Applies to H2
Yes (atomic mass=~1)
Yes (molar mass=~2)
Found free on Earth
No, found bonded to same (=>H2) or other elements (=>H2O, H4C, etc.)
Other information missing includes physical properties such as viscosity, thermal conduction, electrical conduction, critical point, dielectric constant, density over a range of pressures - phase diagram, magnetic properties. Hydrogen as an atmosphere in a star or a planet has much written on the topic, and should have an article linked. This leads to wanting to know its appearance in bulk, and in different conditions. Other uses missing are NMR itself, and manufacture of margarine. So perhaps some should go in here and some in other article(s) on the molecule. Graeme Bartlett (talk) 21:35, 20 May 2015 (UTC)
While looking through our older FAs, I noticed a few minor issues here. I fixed a bare url in the references, and removed an external link that no longer functioned. Appreciate if someone would take a shot at replacing the 4 deadlinks, and eliminating unnecessary "See also" links (many of them are already linked within the article, some quite prominently). Thanks. Maralia (talk) 04:40, 19 May 2015 (UTC)