Although it doesn’t form any bonds, the noble gas can form compounds with salts at high pressure
In 2017, a scientist in Russia discovered that helium forms a stable compound with sodium. Now, scientists in the US have built on that work and discovered that helium can also form compounds with salts such as MgF2 under high pressures.
Helium does not form bonds, but does form these compounds with salts because it reduces interactions between ions of the same charge within the salts. These findings are unexpected, because helium is known as an unreactive element.
Helium is very useful to us, for example it is used in MRI scanners, but is scarce on Earth – helium gas is very light and escapes into space. But, if helium can form compounds, maybe helium is stored in rocks in the Earth’s mantle that we don’t yet know about.
Hundreds of helium compounds could be hiding in Earth’s mantle was first published in Chemistry World