it became incorporated into iron’s atomic lattice, forming compounds designated as FeHex (where x represents the helium content). The presence of helium expanded the iron’s crystal structure ...

Scientists directed helium and hydrogen ... with graphene's electronic structure. This experiment represents a monumental ...

For example hydrogen has the atomic number of one, helium two, lithium three etc. The first energy level (the one nearest the nucleus) can hold a maximum of 2 electrons with the others being able ...