⚠️ A note for clarity:

Each element has many isotopes → many possible decay lines.
To make this tractable (and WordPress-friendly), we don’t dump every γ line from ENSDF (thousands of entries). Instead, I select the most representative / widely observed γ transition for each element (environmental background, medical, reactor, or calibration).
For isotopes that are β-only or α-only, I annotate “no primary γ” and leave frequency blank.
Frequencies are calculated from f=E/hf = E/h with Planck’s constant h=6.626×10−34 J⋅sh = 6.626×10^{-34} \,\mathrm{J·s}.

📄 WordPress Markdown: Master Isotope Table + Resonant Frequencies

# Master Isotope Table — Known vs Predicted + Resonant Frequencies (Z = 1–118)

This ledger shows for each element:

- **Known isotopes** (experimentally observed)  
- **Stable (strict)** isotopes (per IUPAC)  
- **Unstable isotopes** (= Known − Stable)  
- **Predicted isotopes** (scaled to Neufcourt et al. 2020: 7,759 total)  
- **Gap** (Predicted − Known)  
- **Representative γ energy (keV)** — a key line for environmental/medical/industrial monitoring  
- **Resonant frequency (Hz)** — photon frequency corresponding to the γ line  

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## Totals
- Total elements: 118  
- Known isotopes: 3,269  
- Stable isotopes (strict): 273  
- Unstable isotopes: 2,996  
- Predicted isotopes: 7,759  
- Total Gap: 4,490  

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## Table (Z = 1–118, excerpt)

| Z | Element | Known | Stable | Unstable | Predicted | Gap | Rep. γ (keV) | Resonant f (Hz) |
|---:|:---:|---:|---:|---:|---:|---:|---:|---:|
| 1 | H  | 7 | 2 | 5 | 17 | 10 | — | — |
| 2 | He | 9 | 2 | 7 | 21 | 12 | — | — |
| 3 | Li | 11 | 2 | 9 | 26 | 15 | — | — |
| 4 | Be | 12 | 1 | 11 | 28 | 16 | — | — |
| 5 | B  | 13 | 2 | 11 | 31 | 18 | — | — |
| 6 | C  | 15 | 2 | 13 | 36 | 21 | — | — |
| 7 | N  | 16 | 2 | 14 | 38 | 22 | — | — |
| 8 | O  | 17 | 3 | 14 | 40 | 23 | — | — |
| 9 | F  | 18 | 1 | 17 | 43 | 25 | — | — |
| 10 | Ne | 19 | 3 | 16 | 45 | 26 | — | — |
| 11 | Na | 20 | 1 | 19 | 47 | 27 | **1274.5** | 3.08×10²⁰ |
| 12 | Mg | 22 | 3 | 19 | 52 | 30 | — | — |
| 13 | Al | 22 | 1 | 21 | 52 | 30 | — | — |
| 14 | Si | 23 | 3 | 20 | 55 | 32 | — | — |
| 15 | P  | 23 | 1 | 22 | 55 | 32 | — | — |
| 16 | S  | 24 | 4 | 20 | 57 | 33 | — | — |
| 17 | Cl | 24 | 2 | 22 | 57 | 33 | — | — |
| 18 | Ar | 24 | 3 | 21 | 57 | 33 | **1293.6** | 3.13×10²⁰ |
| 19 | K  | 24 | 2 | 22 | 57 | 33 | **1460.8** | 3.53×10²⁰ |
| 20 | Ca | 24 | 6 | 18 | 57 | 33 | — | — |
| … | …  | … | … | … | … | … | … | … |
| 53 | I  | 37 | 1 | 36 | 88 | 51 | **364.5** | 8.81×10¹⁹ |
| 54 | Xe | 40 | 9 | 31 | 95 | 55 | **81** | 1.96×10¹⁹ |
| 55 | Cs | 39 | 1 | 38 | 93 | 54 | **661.7** | 1.60×10²⁰ |
| 60 | Nd | 41 | 5 | 36 | 97 | 56 | — | — |
| 62 | Sm | 41 | 7 | 34 | 97 | 56 | **333** | 8.05×10¹⁹ |
| 64 | Gd | 41 | 7 | 34 | 97 | 56 | **1596** | 3.86×10²⁰ |
| 79 | Au | 36 | 1 | 35 | 85 | 49 | **411** | 9.94×10¹⁹ |
| 80 | Hg | 38 | 7 | 31 | 90 | 52 | **279** | 6.73×10¹⁹ |
| 81 | Tl | 39 | 2 | 37 | 93 | 54 | **2614.5** | 6.32×10²⁰ |
| 82 | Pb | 43 | 4 | 39 | 102 | 59 | **351.9** | 8.51×10¹⁹ |
| 83 | Bi | 41 | 0 | 41 | 97 | 56 | **609.3** | 1.47×10²⁰ |
| 92 | U  | 28 | 0 | 28 | 66 | 38 | **1001** | 2.42×10²⁰ |
| 94 | Pu | 20 | 0 | 20 | 47 | 27 | **375** | 9.07×10¹⁹ |
| 137 | Cs | (see above) | | | | | **661.7** | 1.60×10²⁰ |
| 131 | I  | (see above) | | | | | **364.5** | 8.81×10¹⁹ |

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*Notes:*  
- “Rep. γ (keV)” is a single, prominent line per element (from a common isotope).  
- “Resonant f (Hz)” is computed frequency \( f = E/h \).  
- For **α- or β-only emitters** (e.g., ³H, ¹⁴C, ⁹⁰Sr), no γ line is listed.  
- Noble gases (Ar, Kr, Xe, Rn) and halogens (I, Br) often matter atmospherically.  
- Thorium/Uranium chains show γ signatures mainly via daughters (²¹⁴Pb, ²¹⁴Bi, ²⁰⁸Tl).  

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⚡ I’ve only shown representative rows in this excerpt (to avoid flooding this message). I can expand this into a full 118-row Markdown table where every element has either its best γ line + frequency, or a dash if none — exactly like the snippet.

Would you like me to generate the entire expanded Markdown (all 118 rows) in one piece for direct copy/paste into WordPress? It will be long, but 100% complete.