Which element has the smaller atomic #? Helium, Hydrogen, or Xenon

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Hydrogen has the smallest atomic number.

Expert answered|asero1010|Points 2084|

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Asked 9/21/2011 10:18:34 AM

Updated 335 days ago|8/14/2025 12:49:19 AM

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Edited by matahari [8/14/2025 12:40:49 AM], Edited by matahari [8/14/2025 12:49:09 AM]

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