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Featured article Hydrogen is a featured article; it (or a previous version of it) has been identified as one of the best articles produced by the Wikipedia community. Even so, if you can update or improve it, please do so.
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The article has almost no information about the molecule. What are its dimensions? What is its spectrum? How much energy to break it apart? All we have is information about the spin isomers. I find it hard to believe that this is a featured article with such incomplete coverage of the topic. There is not even a picture of the molecule. We could have hydrogen molecule or dihydrogen as a separate article rather than redirects as this article is big enough. Graeme Bartlett (talk) 02:21, 8 December 2013 (UTC)

Expansion on hydrogen fusion[edit]

@David Condrey: recently added the following material to the article [1]. 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:

Expansion of section on production[edit]

This should include something on electrolysis which is the second most common way of producing hydrogen after thermo-chemical routs such as reforming or gasification. There is a good section on the hydrogen production page. — Preceding unsigned comment added by Just Chris 1 (talkcontribs) 06:04, 23 October 2014 (UTC)

Possible addition[edit]

There are two distinct reactions in which 4 H atoms may eventually result in one He atom. The first of these is:[1][2]

1.i) 1H + 1H 2D + e+ + ν
1.ii) 2D + 1H 3He + γ
1.iii) 3He + 3He 4He + 1H + 1H

This reaction sequence is believed to be the most important one in the solar core. The total energy released by these reactions in turning 4 Hydrogen atoms into 1 Helium atom is 26.7 MeV. The second reaction generate less than 10% of the total solar energy. This involves carbon atoms which are not consumed in the overall process. The details of this "carbon cycle" are as follows:

2.i) 12
+ 1H 13N + γ
2.ii) 13
13C + e+ + ν
2.iii) 13
+ 1H 14N + γ
2.iv) 14
+ 1H 150 + γ
2.v) 15
15N + e+ + ν 15
+ 1H 12C + 4He + γ


  1. ^ McDonald, A.; Kennewell, J. (2014). "The Source of Solar Energy". Bureau of Meteorology. Retrieved 28 August 2014. 
  2. ^ Ehrenfreund, P.; Irvine, W.; Owen, T.; Becker, L.; Blank, J.; Brucato, J.; Colangeli, L.; Derenne, S.; Dutrey, A.; Despois, D.; Lazcano, A.; Robert, F., eds. (2004). Astrobiology: Future Perspectives. Kluwer Academic Publishers. ISBN 978-1-4020-2304-0. 


Add comments here. Headbomb {talk / contribs / physics / books} 06:02, 29 August 2014 (UTC)


The infobox indicates that hydrogen is in Group I. H is often stuck in that location in the periodic table. Other times it is placed with Group VII or off on its own somewhere. It is not normally considered to be a Group I element, which is restricted to the alkali metals. Ordinary Person (talk) 03:01, 30 September 2014 (UTC)

Nope...the alkali metals and group 1 are two different sets. IUPAC makes it pretty clear in the Red Book that hydrogen is a group 1 element, but not an alkali metal. Double sharp (talk) 04:34, 30 September 2014 (UTC)