The blue flame from hydrogen is hard to see so be very careful!

Except for technetium, the first 92 elements, from hydrogen to uranium, exist in nature.

All chemical elements were formed from hydrogen by the processes of nuclear fusion.

"It's a metal made from hydrogen, they build the whole thing in space."

This process of fusion occurs in stars, which derive their energy from hydrogen and helium.

Balmer had been thinking about the spectral lines from hydrogen.

Fuel cells work by producing electricity from hydrogen, with water as a byproduct.

Water is a compound, made from hydrogen and oxygen (both gases).

Memorizing the table from hydrogen to calcium would be very good.

This failure led to a switch from hydrogen to helium.