"How could that keep it up if it floated in hydrogen?"

The Moon is not rich in hydrogen or carbon.

Solvation of H in solid hydrogen had little effect on its spectrum.

They were interested only in hydrogen to be converted into ekti.

The president showing leadership in hydrogen is critical to making the jump.

If that were the case, the 3d-orbital would have the same energy as the 3p-orbital, as it does in hydrogen, yet it clearly doesn't.

You put in oxygen and hydrogen at one end, and water and power come out the other.

This resulted in hydrogen representing a store of potential energy which can be released by nuclear fusion.

The principal quantum number in hydrogen is related to the atom's total energy.

But it is interested in hydrogen as a way to to wean itself off imported oil.