Table 4. HOMO Energies (eV) of Several Closed-Shell Atomic Anions and the Opposite of the Experimental EA As Reference Value.

	BLYP	B3LYP	CAM-B3LYP	SAOP	B-GLLB-VWN	−EA
H–	+1.387	+0.886	–0.340	–0.517	–1.520	–0.754
Li–	+0.539	+0.577	–0.109	–0.329	–0.830	–0.618
Na–	+0.473	+0.282	–0.176	–0.347	–0.791	–0.549
K–	+0.621	+0.433	–0.073	–0.360	–0.696	–0.497
F–	+1.289	+0.021	–1.876	–2.626	–3.706	–3.401
Cl–	+0.306	–0.722	–2.408	–3.463	–4.306	–3.613
Br–	–0.100	–1.062	–2.700	–3.812	–4.327	–3.364
MSE	+2.47	+1.89	+0.73	+0.19	–0.48
MAE	+2.47	+1.89	+0.73	+0.32	+0.48