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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:
... that an alloy of aluminium and gallium in pellet form added to water could be used to generate hydrogen.
Not true: the fact "discovered in 2007" was described in chemistry handbook printed in 1956 (Tołłoczko, Kemula "Chemia nieorganiczna", XI edition, PWN Warszawa 1956, p. 540); unfortunately there is no information, when the reaction was discovered - possibly much earlier.
why would the symbol for hydrogen be D or T? 220.127.116.11 (talk) 01:14, 3 November 2016 (UTC)
I have no idea; those are just isotopes of hydrogen, not special elements. The interesting variant of the question is why those isotopes have special names but no isotope of any other chemical element has a special name. Georgia guy (talk) 13:45, 3 November 2016 (UTC)
Since you've responded to this, I'll refrain from deleting this troll question that is clearly intended to waste people's time, since this is already in the article (and, what do you know, the editor is posting this on the right article instead of symbol (chemistry), indicating that s/he knows the answer already, and has been disrupting the extended-periodic-table articles for ages). The reason why only the hydrogen isotopes have separate names is that it is only for them that the difference in mass is large enough (100% for H vs D) to cause easily observable effects. For instance, if you live on a diet solely involving the 13C isotope, nothing will happen to you. If you attempt to substitute all your protium with deuterium, you will die. Double sharp (talk) 13:53, 3 November 2016 (UTC)