| Index | Element | Z | I.S. | ¡÷E | Method | Ref. | Conf. | Level | |
| 1 | Cu | 29 | Ca | 2490 | COMP | R121 | 3d2 | 3 F3 | |
| 2 | Cu | 29 | Ca | 5490 | COMP | R121 | 3d2 | 3 F4 | |
| 3 | Cu | 29 | Ca | 20000 | COMP | R121 | 3d2 | 1 G4 | |
| 4 | Cu | 29 | Ca | 24140 | COMP | R121 | 3d2 | 1 D2 | |
| 5 | Cu | 29 | Ca | 30210 | COMP | R121 | 3d2 | 3 P0 | |
| 6 | Cu | 29 | Ca | 30690 | COMP | R121 | 3d2 | 3 P1 | |
| 7 | Cu | 29 | Ca | 30840 | COMP | R121 | 3d2 | 3 P2 | |
| 8 | Cu | 29 | Ca | 646870 | COMP | R121 | 3s23p5{3d3[2H] | 3 G3 | |
| 9 | Cu | 29 | Ca | 650310 | COMP | R121 | 3s23p5{3d3[2H] | 3 G4 | |
| 10 | Cu | 29 | Ca | 655820 | COMP | R121 | 3s23p5{3d3[2H] | 3 G5 | |
| 11 | Cu | 29 | Ca | 670570 | COMP | R121 | 3s23p5{3d3[2H] | 1 H5 | |
| 12 | Cu | 29 | Ca | 713920 | COMP | R121 | 3s23p5{3d3[4F] | 3 F2 | |
| 13 | Cu | 29 | Ca | 717450 | COMP | R121 | 3s23p5{3d3[4F] | 3 F3 | |
| 14 | Cu | 29 | Ca | 720950 | COMP | R121 | 3s23p5{3d3[4F] | 3 F4 | |
| 15 | Cu | 29 | Ca | 749740 | COMP | R121 | 3s23p5{3d3[2H] | 1 G4 | |
| 16 | Cu | 29 | Ca | 756200 | COMP | R121 | 3s23p5{3d3[4F] | 3 D1 | |
| 17 | Cu | 29 | Ca | 757180 | COMP | R121 | 3s23p5{3d3[4F] | 3 D3 | |
| 18 | Cu | 29 | Ca | 757330 | COMP | R121 | 3s23p5{3d3[4F] | 3 D2 | |
| 19 | Cu | 29 | Ca | 1152390 | COMP | R121 | 3d4f | 3 F2 | |
| 20 | Cu | 29 | Ca | 1153140 | COMP | R121 | 3d4f | 3 F3 |
¡¾Close¡¿ Online: 7
Noted that here
'I.S.' ---------- the isoelectronic sequence
'Z' ---------- atomic number
'Conf.' ---------- configuration
'Level' ---------- the notation of energy level
'E' ---------- the value of the energy level
'¡÷E' ---------- error for energy level
'Method' ---------- the method by which the data is produced
'Ref.' ---------- the reference