| Index | Element | Z | I.S. | ¡÷E | Method | Ref. | Conf. | Level | |
| 1 | Na | 11 | Na | 15954.3 | THR | R50 | 3p | 2 P1/2 | |
| 2 | Na | 11 | Na | 15965.8 | THR | R50 | 3p | 2 P3/2 | |
| 3 | Na | 11 | Na | 27762.7 | THR | R50 | 3d | 2 P3/2 | |
| 4 | Na | 11 | Na | 27762.8 | THR | R50 | 3d | 2 P5/2 | |
| 5 | Na | 11 | Na | 39570 | COMP | R1 | 3s | 2 S1/2 | |
| 6 | Na | 11 | Na | 238376 | THR | R50 | 2s22p53s2 | 2 P3/2 | |
| 7 | Na | 11 | Na | 239716 | THR | R50 | 2s22p53s2 | 2 P1/2 | |
| 8 | Na | 11 | Na | 248160 | COMP | R1 | 2s22p53s2 | 2 P3/2 | |
| 9 | Na | 11 | Na | 249500 | COMP | R1 | 2s22p53s2 | 2 P1/2 | |
| 10 | Na | 11 | Na | 253773 | THR | R50 | 2s22p53s[3P]3p | 4 S3/2 | |
| 11 | Na | 11 | Na | 255861 | THR | R50 | 2s22p53s[3P]3p | 4 D5/2 | |
| 12 | Na | 11 | Na | 256200 | THR | R50 | 2s22p53s[3P]3p | 4 D3/2 | |
| 13 | Na | 11 | Na | 256500 | THR | R50 | 2s22p53s[3P]3p | 4 D1/2 | |
| 14 | Na | 11 | Na | 256906 | THR | R50 | 2s22p53s[3P]3p | 4 P5/2 | |
| 15 | Na | 11 | Na | 257319 | THR | R50 | 2s22p53s[3P]3p | 4 P3/2 | |
| 16 | Na | 11 | Na | 257473 | THR | R50 | 2s22p53s[3P]3p | 4 P1/2 | |
| 17 | Na | 11 | Na | 258452 | THR | R50 | 2s22p53s[1P]3p | 2 D3/2 | |
| 18 | Na | 11 | Na | 258925 | THR | R50 | 2s22p53s[1P]3p | 2 D5/2 | |
| 19 | Na | 11 | Na | 259096 | THR | R50 | 2s22p53s[1P]3p | 2 P1/2 | |
| 20 | Na | 11 | Na | 259390 | THR | R50 | 2s22p53s[1P]3p | 2 P3/2 |
¡¾Close¡¿ Online: 12
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