Solved cryptogram

Hydrogen has one proton and one electron, which makes it the simplest atom that can exist.

Chemistry Facts, sourced to Royal Society of Chemistry.

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What it means

There is nothing below it. An atom needs at least one proton to be an element at all, and hydrogen has exactly one, with a single electron to balance it. Everything heavier was built out of hydrogen inside stars. It is also the great majority of ordinary matter in the universe by count of atoms, which makes the simplest thing in chemistry also the commonplace one.

The claim comes from Royal Society of Chemistry.

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