Table I.

Atomic kinetic, exchange, and correlation, energies (in hartrees) from various schemes of computations. The exact values are computed with Hartree-Fock densities.

Atoms	Kinetic energy				Exchange energy			Correlation energy
	T exact ♣	T 0 ♣	T0+T2♣	T Padé ♣	K exact ♦	K 0 ♥	K B88 ♥	E c exact ♦	E c (139) ♠	E c •
He	2.86168	2.56054	2.87850	2.87639	−1.0260	−0.884	−1.025	−0.0425	−0.0215	−0.0681
Li	7.43273	6.70062	7.50504	7.44941	−1.7812	−1.538	−1.775	−0.0454	−0.0486	−0.0815
Be	14.5730	13.1286	14.6466	14.4223	−2.6669	−2.312	−2.658	−0.0945	−0.0820	−0.1192
B	24.5291	22.0720	24.5228	24.2089	−3.7438	−3.272	−3.728	−0.1247	−0.1197	−0.1625
C	37.6886	34.0144	37.5988	37.2533	−5.0444	−4.459	−5.032	−0.1566	−0.1609	−0.2091
N	54.4009	49.4771	54.3852	54.0643	−6.5971	−5.893	−6.589	−0.1850	−0.2050	−0.2567
O	74.8094	67.8965	74.3573	74.1625	−8.1752	−7.342	−8.169	−0.2579	−0.2512	−0.3035
F	99.4093	90.4598	98.6429	98.6959	−10.003	−9.052	−10.02	−0.332	−0.2996	−0.3510
Ne	128.547	117.761	127.829	128.221	−12.108	−11.03	−12.14	−0.390	−0.3498	−0.3987
Na	161.859	148.809	161.093	161.718	−14.017	−12.79	−14.03	−0.398	−0.3892	−0.4137
Mg	199.614	184.017	198.749	199.578	−15.994	−14.61	−16.00	−0.443	−0.4351	−0.4491
Al	241.877	223.443	240.868	242.008	−18.069	−16.53	−18.06	−0.480	−0.4809	−0.4863
Si	288.854	267.315	287.659	289.139	−20.280	−18.59	−20.27	−0.521	−0.5308	−0.5308
Cl	459.482	426.865	457.321	460.117	−27.512	−25.35	−27.49	−0.714	−0.6901	−0.6710
Ar	526.817	490.017	524.289	527.617	−30.185	−27.86	−30.15	−0.787	−0.7459	−0.7190

^♣: from Ref. [71] and references therein;

^♦: from Ref. [107] and references therein;

^♥: from Ref. [84];

^♠: from eq. (139) and Ref. [90];

^•: from fitting equation E_c=−0.04682N + 0.005753<ρ^2/3>−0.00096<ρ^1/3>, see Ref. [90] and references therein