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

Table 3

Ionization energies (eV) of isoelectronic series from the CRC Handbook (5 to 18 electron sequences)—first six members of each series.

𝑍	(2)	(3)	(4)	(5)	(6)	(7)
	First	Second	Third	Fourth	Fifth	Sixth
B	8.298	24.383	47.449	77.414	114.243	157.930
C	11.260	29.601	54.936	87.140	126.210	172.180
N	14.534	35.121	62.708	97.120	138.400	186.760
O	13.618	34.971	63.450	98.910	141.270	190.490
F	17.423	40.963	71.620	109.266	153.825	205.270
Ne	21.565	47.286	80.144	119.992	166.767	220.421
Na	5.139	15.035	28.448	45.142	65.025	88.053
Mg	7.646	18.829	33.493	51.444	72.595	97.030
Al	5.896	16.346	30.203	47.222	67.800	91.009
Si	8.152	19.770	34.790	53.465	75.020	99.400
P	10.487	23.338	39.610	59.810	82.660	108.780
S	10.360	23.814	40.740	60.910	84.500	110.680
Cl	12.968	27.630	45.806	67.270	91.650	119.530
Ar	15.760	31.630	50.913	73.489	99.300	128.130