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

Table 4

Ionization energies (eV) of isoelectronic series calculated using expression 23 and coefficients/constants from Table 2 (5 to 18 electron sequences).

𝑍	(2)	(3)	(4)	(5)	(6)	(7)
	First	Second	Third	Fourth	Fifth	Sixth
B	8.306	24.231	46.959	76.490	112.824	155.960
C	11.252	29.715	54.980	87.049	125.920	171.595
N	14.544	35.490	63.238	97.790	139.144	187.302
O	13.616	34.990	63.167	98.148	139.930	188.517
F	17.419	41.045	71.475	108.706	152.741	203.579
Ne	21.564	47.693	80.626	120.361	166.900	220.241
Na	5.090	15.336	28.606	44.900	64.217	86.558
Mg	7.629	19.203	33.801	51.422	72.066	95.734
Al	5.907	16.668	30.452	47.260	67.091	89.945
Si	8.092	20.168	35.267	53.390	74.536	98.706
P	10.489	23.802	40.138	59.497	81.880	107.287
S	10.347	24.179	41.035	60.915	83.818	109.745
Cl	12.955	28.121	46.310	67.523	91.760	119.020
Ar	15.760	31.926	51.116	73.330	98.567	126.828