In what alternate reality might the born-oppenheimer approximation not be valid? without this approximation what would need to change about the schrödinger equation for the hydrogen (or any molecule)?

i dont know

explanation:

fdvwsa gfwsargebgeebbfwfwffw gwf   vgwgw gw f gwgw fgw v v dsv dwfff

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.

a electronegativity decreases beacuse the size of nucleus is bigger.