Question

Hydrogen and Helium are solid at low temperature and elevated pressure. Do you expect these to be a metal or an insulator?
1.Solid Hydrogen and Helium have a filled s-band. 2).Solid Hydrogen and Helium heve a half filled s-band.3) Solid Hydrogen and Helium have a half filled p-band 4) The band gap is less than 3eV . 5) The s and p-bands overlap. 6) The bond length between helium atoms is very small. 7)The valence band is filled.8) The conduction band is filled.9) A gap exists between the s and p-bands.