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The answer to this question is Hydrogen. If you have an periodic table, you will see that the only element with a mass close to 1 is Hydrogen, and that is because 1 atom of Hydrogen weighs 1 Atomic Mass Unit.

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The first answer is not correct !

The Atomic Mass unit is 1/12 from the atomic mass of the isotope 12C in his ground state.

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12y ago

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