Which of the following phenomena suggests the presence of electron energy levels in atoms

Which of the following phenomena will occur when two atoms of the elements having same spin of electron approach for bonding ?

For H-atom, the energies of electronic levels depend upon

An electron in excited hydrogen atom falls from fifth energy level to second energy level. In which of the following regions, the spectral line will be observed and is part of which series of the atomic spectrum?

An electron in excited hydrogen atom falls from fifth energy level to second energy level. In which of the following regions, the spectral line will be observed and is part of which series of the atomic spectrum?

In a potassium atom, electronic energy levels are in the following order

Multiple or fine structure of spectral lines is due to : (a)presence of main energy levels (b)presence of sub-levels (c)presence of electronic configuration (d)is not a characteristics of the atom

An electron is excited to fourth energy level in an atom. It will

An electron is excited to fourth energy level in an atom. It will