A chemical element is one of those squares ... If an atom has 2 protons, that’s an atom of the element helium. If it has 7 protons, that’s nitrogen. But the logic of the periodic table also ...

The presence of one of these elements, helium, had been demonstrated in the ... unless they are restrained by chemical combination. They then collect around the great centers of attraction ...

A giant, gaping hole that opened up in the Sun's atmosphere has been identified as the source of a surprising abundance of a ...

The first 94 chemical elements, up to plutonium ... This diagram shows helium. Is helium a solid, liquid or a gas? Is it made up of atoms or molecules? Helium is a gas made up of atoms.

"I have spent many years studying the geological and chemical processes that take ... a reservoir trapped in the lower mantle. Helium isn't the only element with a primordial isotope, either ...

Particle-accelerator study focuses on the r-process thought to be responsible for forming elements heavier than iron ...

Helium is one of our few non-renewable resources, and yet it is critical for many applications as an inert gas and as one of the coldest substances known. The unique properties of this “endangered ...