Why hydrogen is not used to compare the relative atomic mass

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Is that because of some historical reasons or E=mc2(i mean something about binding energy)?
 

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jtbell
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See the section "History of the atomic mass unit" on this page:

http://www.sizes.com/units/atomic_mass_unit.htm [Broken]

(I first went to the Wikipedia page about the atomic mass unit, which doesn't say much about the early history; then followed the "external link" at the end of the article.)
 
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