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Hydrogen is the smallest atom by mass. Helium, neon, fluorine and oxygen are smaller in size. Many calculations put the helium as the smallest atom. But a few other calculations put neon as the smallest atom!

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14y ago
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AnswerBot

5mo ago

The smallest atom is hydrogen, with a single proton in its nucleus and one electron orbiting around it.

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12y ago

The smallest atom is a Hydrogen atom, it consists of one proton and one electron.

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12y ago

It is electron.

Neutrinos are at least a million times less massive than electrons.

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12y ago

The smallest units of an atom are quarks and gluons; protons and neutrons contain these particles.

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Q: What is the smallest atom?
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