Methods of Calculating Ionization Energies of Multielectron (Five or More) Isoelectronic Atomic Ions

Table 9

Coefficients/constants proposed by Agmon to calculate ionization energies of isoelectronic sequences.

𝑍	(2)	(3)
	𝑛^∗	𝑆
B	1.961	3.36
C	1.954	4.09
N	1.952	4.82
O	1.934	5.83
F	1.930	6.57
Ne	1.930	7.32
Na	2.865	8.78
Mg	2.851	9.46
Al	2.849	10.70
Si	2.835	11.40
P	2.814	12.13
S	2.797	13.10
Cl	2.770	13.88
Ar	2.737	14.68