Moseley Law and Spectral Atomic Periodicity

Atomic Bohr s spectra are based from the transition energies given before however, we may identify the so called spectral term 

for a many-electronic atom, the hydrogenic Bohr treatment can be still preserved with the price of introducing the so-called shielding constant cr 

Quantum Nanochemistty-Volume I Quantum Theory and Observability 

for practical use the frequency is to be employed, rather than individual spectral terms in this case one firstly has in generally that  

As a specialization, for instance, for K lines (n=, n=2) the shielding constants can be further assumed as cr = 1 so that the Moseley woiking formula is obtained  

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