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proton has the smallest mass of about 1.67277 x 10-27kg

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Does subatomic particles have the smallest mass of any subatomic particle?

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Positively charged subatomic partical?

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Hydrogen has the smallest atomic mass at roughly 1.008 grams per mol (6.02x10^23 atoms)


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What pure substance can be broken down chemically?

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With a mass of about 9.10938215×10−31 kg. (0.510998910 MeV), electrons are not known to be formed of anything smaller than themselves. They are thus, elementary particles.