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

Table 7

Ionization energies (eV) of isoelectronic series using (20) and constants/coefficients in Table 2*.

𝑍	(2)	(3)	(4)	(5)	(6)	(7)
	Third	Fourth	Fifth	Sixth	Seventh	Eighth
Sc	24.780	43.879	66.002	91.149	119.319	150.513
Ti	27.479	47.386	70.316	96.270	125.247	157.248
V	29.330	49.676	73.044	99.436	128.852	161.291
Cr	30.917	51.873	75.853	102.856	132.882	165.932
Mn	33.670	55.351	80.056	107.785	138.537	172.313
Fe	30.642	52.034	76.448	103.887	134.349	167.834
Co	33.509	55.453	80.421	108.413	139.428	N/A

∗Ionization energy of isoelectronic series starting from the third ionization energy of the appropriate series.