Electromangnetic radiation with maximum wavelength is:

Which electronic level would allow the hydrogen atom to absorb a photon but not to emit a photon?

The increasing order (lowest first) for the values of e/m (charges/mass) for electron (e), proton (p), neutron (n) and alpha particle ($$\alpha$$) is:

Correct set of four quantum numbers for the valence (outermost) electron of rubidium (Z = 37) is