![]() Based upon the above information, arrange the following orbitals in the increasing order of energy. Values of (n+l), the orbital with lower value of n will have lower energy. Lower the value of (n+l ), lower is the energy. ![]() The arrangement of orbitals on the basis of energy is based upon their (n+l ) value. In a given atom no two electrons can have the same values for all the four quantum numbers. If the value of n+l for two orbitals is equal then the orbital with a lower value of n will have a lower energy level. The above order is based on Madulung Rule which states thatĪ.The sum of the values of the principal quantum numbers (n) and azimuthal quantum number (l) i.e (n+l) determined the energy level of an orbital.Subshell having lower n+l value will be filled firstī.The lower value of the sum of (n+l) implies that the energy of the orbital is low.This can be remembered with below diagram But Following ordering can be used to predict the configuration of electrons in atomġs, 2s ,2p, 3s ,3p ,4s ,3d ,4p, 5s,4d,5p,4f,5d,6p. ![]() So there is no single ordering of energies of orbitals which will be universally correct for all atoms
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