| 1 | H | 7 | 2 | 5 | 17 | 10 | — | — | — | — | β-only (³H) |
| 2 | He | 9 | 2 | 7 | 21 | 12 | — | — | — | — | noble gas |
| 3 | Li | 11 | 2 | 9 | 26 | 15 | — | — | — | — | no standard γ (very soft X-ray region) |
| 4 | Be | 12 | 1 | 11 | 28 | 16 | — | — | — | — | no standard γ (very soft X-ray region) |
| 5 | B | 13 | 2 | 11 | 31 | 18 | — | — | — | — | no standard γ (very soft X-ray region) |
| 6 | C | 15 | 2 | 13 | 36 | 21 | — | — | 0.277 | 6.70×10^16 | XRF Kα₁ |
| 7 | N | 16 | 2 | 14 | 38 | 22 | — | — | 0.392 | 9.48×10^16 | XRF Kα₁ |
| 8 | O | 17 | 3 | 14 | 40 | 23 | — | — | 0.525 | 1.27×10^17 | XRF Kα₁ |
| 9 | F | 18 | 1 | 17 | 43 | 25 | — | — | 0.677 | 1.64×10^17 | XRF Kα₁ |
| 10 | Ne | 19 | 3 | 16 | 45 | 26 | — | — | 0.849 | 2.05×10^17 | XRF Kα₁ |
| 11 | Na | 20 | 1 | 19 | 47 | 27 | 1274.5 | 3.08×10^20 | 1.041 | 2.52×10^17 | ²²Na PET/industrial; Kα₁ XRF |
| 12 | Mg | 22 | 3 | 19 | 52 | 30 | — | — | 1.253 | 3.03×10^17 | XRF Kα₁ |
| 13 | Al | 22 | 1 | 21 | 52 | 30 | — | — | 1.486 | 3.59×10^17 | XRF Kα₁ (ubiquitous) |
| 14 | Si | 23 | 3 | 20 | 55 | 32 | — | — | 1.740 | 4.21×10^17 | XRF Kα₁ |
| 15 | P | 23 | 1 | 22 | 55 | 32 | — | — | 2.013 | 4.87×10^17 | XRF Kα₁ |
| 16 | S | 24 | 4 | 20 | 57 | 33 | — | — | 2.307 | 5.58×10^17 | XRF Kα₁ |
| 17 | Cl | 24 | 2 | 22 | 57 | 33 | — | — | 2.622 | 6.34×10^17 | XRF Kα₁ |
| 18 | Ar | 24 | 3 | 21 | 57 | 33 | 1293.6 | 3.13×10^20 | 2.957 | 7.15×10^17 | ⁴¹Ar activation gas; XRF Kα₁ |
| 19 | K | 24 | 2 | 22 | 57 | 33 | 1460.8 | 3.53×10^20 | 3.312 | 8.00×10^17 | ⁴⁰K background; XRF Kα₁ |
| 20 | Ca | 24 | 6 | 18 | 57 | 33 | — | — | 3.691 | 8.92×10^17 | XRF Kα₁ |
