Hydrogen is an element; it exists naturally as a molecule. Each hydrogen molecule is made up of two hydrogen atoms. In hydrogen cars hydrogen reacts with oxygen in a fuel cell, making electricity ...

H2O. An almost negligible proportion of a few per million consists of "heavy water," in which the hydrogen atoms (H) are ...

Water covers more than 70% of our planet, and it’s made of H₂O—two hydrogen atoms bonded to one oxygen atom. But there’s also ...

This study demonstrates that hydrogen atoms generated in gibbsite ... While the surface concentrations of these residual ions ...