Yonghe Zhang ionocovalent theory applications (3).
Zhang Effective Nuclear Charge
American Huilin Institute http://www.amhuilin.com/
Based on the Bohr energy levels
E = - Z2me4/8n2h2 ɛ02 = - RZ2/n2
a spectroscopic quantum model for easily calculating the effective nuclear charge Z* and the effective principal quantum number n* from the ionization energy Iz of the all orbitals from 1s to nf is established [1,2]:
Where Iz is the ultimate IE [1,2]. R is the Rydberg constant, R = 2p2µ42e4/h2 = 13.6 eV, h is Planck’s constant.
No longer using the traditional rules for estimating artificially the shielding effects, the model successfully derived many important quantitative methods such as the IC-model, electronegativity, Lewis acid strengths, crosslink density and effective Polarizing Power, which can calculate and describe quantitatively chemical phenomena and the dual observations of the ionocovalent bond, correlated with chemical theorems and regulations and predicted chemical processes and products .
The effective nuclear charge values of all orbital are listed in the Chart :
Zhang Effective Nuclear Charge American Huilin Institute May 29, 2012
 Y. Zhang, J. Molecular Science，1 (1981) 125.
 Y. Zhang, Inorg Chem. 21 (1982) 3886.
 Y. Zhang, A Spectroscopic Quantum Model: 1. Effective Nuclear Charge 2. Effective Principal Quantum Number J. Am. Huilin Ins. 2012, 4, 1-23