I ' Member ! <| sep |> uspez must resign immediately . <| sep |> TF 2 is one of the best examples I can think of when it comes to amazing game sequels . It took an amazing concept from TFC and just expanded upon it in every good way imaginable to make one of the most unique games I have ever played . There is still no game out on the market right now that I can think of that has the same big customization and mod support that TF 2 has . <| sep |> What determines which direction the wave function of the electron uses as it ' s zaxis why do the orbitals in an atom have any specific spatial orientation as opposed to any other arbitrary one ? We arbitrarily select z to be the direction relative to which we measure angular momenta . But orbitals which are not spherically symmetric have angular momentum . The direction of the angular momentum defines the symmetry axis , meaning that ' s the special direction in space .