Lifetimes (s)	Energy levels (cm ⁻¹ )	Configurations	Terms	Leading Percentage
1.096 × 10 ⁻⁹	208,204	1s ² 2p	² P 1/2	100%
9.360 × 10 ⁻¹⁰	219,430	1s ² 2p	² P 3/2	100%
1.539 × 10 ⁻¹²	2,846,080	1s ² 3p	² P 1/2	100%
1.533 × 10 ⁻¹²	2,849,410	1s ² 3p	² P 3/2	100%
2.613 × 10 ⁻¹²	3,756,701	1s ² 4p	² P 1/2	100%
2.608 × 10 ⁻¹²	3,764,548	1s ² 4p	² P 3/2	100%
2.547 × 10 ⁻¹²	^*3,774,240	1s ² 4f	² F 5/2	100%
2.553 × 10 ⁻¹²	^*3,774,380	1s ² 4f	² F 7/2	100%
4.396 × 10 ⁻¹²	^*4,193,330	1s ² 5p	² P 1/2	100%
4.392 × 10 ⁻¹²	^*4,193,980	1s ² 5p	² P 3/2	100%
4.773 × 10 ⁻¹²	^*4,199,015	1s ² 5f	² F 5/2	100%
4.783 × 10 ⁻¹²	^*4,199,115	1s ² 5f	² F 7/2	100%
7.060 × 10 ⁻¹²	^*4,422,548	1s ² 6p	² P 1/2	100%
7.055 × 10 ⁻¹²	^*4,422,920	1s ² 6p	² P 3/2	100%
8.124 × 10 ⁻¹²	^*4,425,825	1s ² 6f	² F 5/2	100%
8.135 × 10 ⁻¹²	^*4,425,885	1s ² 6f	² F 7/2	100%
2.126 × 10 ⁻¹¹	^*4,426,025	1s ² 6h	² H 9/2	100%
2.127 × 10 ⁻¹¹	^*4,426,050	1s ² 6h	² H 11/2	100%
1.071 × 10 ⁻¹¹	^*4,560,525	1s ² 7p	² P 1/2	100%
1.070 × 10 ⁻¹¹	^*4,560,760	1s ² 7p	² P 3/2	100%
1.554 × 10 ⁻¹¹	^*4,649,965	1s ² 8p	² P 1/2	100%
1.554 × 10 ⁻¹¹	^*4,650,120	1s ² 8p	² P 3/2	100%
6.017 × 10 ⁻¹¹	17,024,200	1s2s2p	( ³ S) ⁴ P 1/2	100%
2.245 × 10 ⁻¹¹	17,028,110	1s2s2p	( ³ S) ⁴ P 3/2	100%
4.400 × 10 ⁻³	^*17,035,000	1s2s2p	( ³ S) ⁴ P 5/2	100%
2.219 × 10 ⁻¹⁴	17,186,895	1s2s2p	( ¹ P) ² P 1/2	61% + 39% 1s2s2p ( ³ S) ² P
2.067 × 10 ⁻¹⁴	17,191,815	1s2s2p	( ³ S) ² P 3/2	50% + 50% 1s2s2p ( ¹ S) ² P
1.461 × 10 ⁻¹³	17,261,115	1s2s2p	( ³ S) ² P 1/2	61% + 39% 1s2s2p ( ¹ S) ² P
2.860 × 10 ⁻¹³	17,264,350	1s2s2p	( ¹ P) ² P 3/2	50% + 50% 1s2s2p ( ³ S) ² P
6.847 × 10 ⁻¹¹	19,920,720	1s2s3p	( ³ S) ⁴ P 1/2	100%
2.375 × 10 ⁻¹¹	19,921,845	1s2s3p	( ³ S) ⁴ P 3/2	100%
3.585 × 10 ⁻⁹	^*19,923,960	1s2s3p	( ³ S) ⁴ P 5/2	100%
9.801 × 10 ⁻¹⁴	19,949,895	1s2s3p	( ³ S) ² P 3/2	99%
9.787 × 10 ⁻¹⁴	19,951,015	1s2s3p	( ³ S) ² P 1/2	100%
2.294 × 10 ⁻¹³	^*20,054,080	1s2s3p	( ¹ P) ² P 1/2	100%