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Hydrogen. You could have found this out yourself had you just looked at a periodic table of elements.
First answer by Lazar. Last edit by Lazar. Contributor trust: 66 [recommend contributor]. Question popularity: 13 [recommend question]
Answers.com > Wiki Answers > Categories > Science > Chemistry > What is the least massive and the simplest of all elements?
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The simplest of all atomic elements? What is the simplest of all elements? Are elements the simplest forms of matter? Which is the lighest and simplest of all solid elements? What is the lightest and simplest of all solid elements?
