Why can a helium molecule not be formed?

Do you know why atoms combine ? Atoms combine to form molecules to achieve stability. There are already 2 electrons in the 's' shell of helium atom. read more

Atoms combine to form molecules to achieve stability. There are already 2 electrons in the 's' shell of helium atom. Since its valence shell is filled completely, helium atom is stable and doesn't bond to form helium molecule. read more

A helium molecule does exist, but it is made up of only a single atom. He is a noble element, and as such its valence electron shell (its only electron shell) is complete. It does not require any more electrons to fill it, and therefore in all but the most extreme of conditions will not form a diatomic molecule like H2, N2, O2, and others. read more

Excimers do not last for long, as the molecule containing the higher energy level helium atom can rapidly decay back to a repulsive ground state, where the two atoms making up the bond repel. However, in some locations such as helium white dwarfs, conditions may be suitable to rapidly form excited helium atoms. read more