 Hydrogen

Hydrogen is the chemical element with atomic number 1 and symbol $\mathrm{H}$. A neutral hydrogen atom has one electron, while its most abundant nucleus contains a single proton. Elemental hydrogen commonly forms molecular hydrogen, ${\mathrm{H}}_2$. Its isotopes allow mass-sensitive tests of molecular vibrations and isotope effects.^[ref]

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This is a section about Hydrogen!

Hydrogen is a very important subject about which there is a lot to say.

For example, this sentence. And then another one.