Known,Stable,Unstable,Predicted,GapGamma_keV(representative γ lines;nullwhen not used operationally)NIST_Kalpha1_keV(filled for Z = 6–92;nullfor Z > 92)Context(short usage note)
If you want a CSV too, say the word—I’ll render a compact CSV with the same fields.
[
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{"Z":2,"Element":"He","Known":9,"Stable":2,"Unstable":7,"Predicted":21,"Gap":12,"Gamma_keV":null,"NIST_Kalpha1_keV":null,"Context":"noble gas"},
{"Z":3,"Element":"Li","Known":11,"Stable":2,"Unstable":9,"Predicted":26,"Gap":15,"Gamma_keV":null,"NIST_Kalpha1_keV":null,"Context":"no strong γ"},
{"Z":4,"Element":"Be","Known":12,"Stable":1,"Unstable":11,"Predicted":28,"Gap":16,"Gamma_keV":null,"NIST_Kalpha1_keV":null,"Context":"—"},
{"Z":5,"Element":"B","Known":13,"Stable":2,"Unstable":11,"Predicted":31,"Gap":18,"Gamma_keV":null,"NIST_Kalpha1_keV":null,"Context":"neutron capture"},
{"Z":6,"Element":"C","Known":15,"Stable":2,"Unstable":13,"Predicted":36,"Gap":21,"Gamma_keV":null,"NIST_Kalpha1_keV":0.277,"Context":"XRF line"},
{"Z":7,"Element":"N","Known":16,"Stable":2,"Unstable":14,"Predicted":38,"Gap":22,"Gamma_keV":null,"NIST_Kalpha1_keV":0.392,"Context":"XRF line"},
{"Z":8,"Element":"O","Known":17,"Stable":3,"Unstable":14,"Predicted":40,"Gap":23,"Gamma_keV":null,"NIST_Kalpha1_keV":0.525,"Context":"XRF line"},
{"Z":9,"Element":"F","Known":18,"Stable":1,"Unstable":17,"Predicted":43,"Gap":25,"Gamma_keV":null,"NIST_Kalpha1_keV":0.677,"Context":"XRF line"},
{"Z":10,"Element":"Ne","Known":19,"Stable":3,"Unstable":16,"Predicted":45,"Gap":26,"Gamma_keV":null,"NIST_Kalpha1_keV":0.849,"Context":"noble gas"},
{"Z":11,"Element":"Na","Known":20,"Stable":1,"Unstable":19,"Predicted":47,"Gap":27,"Gamma_keV":[1274.5],"NIST_Kalpha1_keV":1.041,"Context":"²²Na PET"},
{"Z":12,"Element":"Mg","Known":22,"Stable":3,"Unstable":19,"Predicted":52,"Gap":30,"Gamma_keV":null,"NIST_Kalpha1_keV":1.253,"Context":"XRF line"},
{"Z":13,"Element":"Al","Known":22,"Stable":1,"Unstable":21,"Predicted":52,"Gap":30,"Gamma_keV":null,"NIST_Kalpha1_keV":1.486,"Context":"XRF line"},
{"Z":14,"Element":"Si","Known":23,"Stable":3,"Unstable":20,"Predicted":55,"Gap":32,"Gamma_keV":null,"NIST_Kalpha1_keV":1.740,"Context":"ubiquitous XRF"},
{"Z":15,"Element":"P","Known":23,"Stable":1,"Unstable":22,"Predicted":55,"Gap":32,"Gamma_keV":null,"NIST_Kalpha1_keV":2.013,"Context":"biochemical"},
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{"Z":17,"Element":"Cl","Known":24,"Stable":2,"Unstable":22,"Predicted":57,"Gap":33,"Gamma_keV":null,"NIST_Kalpha1_keV":2.622,"Context":"XRF line"},
{"Z":18,"Element":"Ar","Known":24,"Stable":3,"Unstable":21,"Predicted":57,"Gap":33,"Gamma_keV":[1293.6],"NIST_Kalpha1_keV":2.957,"Context":"⁴¹Ar tracer"},
{"Z":19,"Element":"K","Known":24,"Stable":2,"Unstable":22,"Predicted":57,"Gap":33,"Gamma_keV":[1460.8],"NIST_Kalpha1_keV":3.312,"Context":"⁴⁰K background"},
{"Z":20,"Element":"Ca","Known":24,"Stable":6,"Unstable":18,"Predicted":57,"Gap":33,"Gamma_keV":null,"NIST_Kalpha1_keV":3.691,"Context":"bone tracer"},
{"Z":21,"Element":"Sc","Known":25,"Stable":1,"Unstable":24,"Predicted":59,"Gap":34,"Gamma_keV":[889.3,1120.5],"NIST_Kalpha1_keV":4.090,"Context":"⁴⁶Sc γ"},
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{"Z":23,"Element":"V","Known":26,"Stable":1,"Unstable":25,"Predicted":62,"Gap":36,"Gamma_keV":[983.5],"NIST_Kalpha1_keV":4.952,"Context":"⁴⁸V tracer"},
{"Z":24,"Element":"Cr","Known":26,"Stable":4,"Unstable":22,"Predicted":62,"Gap":36,"Gamma_keV":[320.1],"NIST_Kalpha1_keV":5.415,"Context":"⁵¹Cr tracer"},
{"Z":25,"Element":"Mn","Known":26,"Stable":1,"Unstable":25,"Predicted":62,"Gap":36,"Gamma_keV":[834.8],"NIST_Kalpha1_keV":5.899,"Context":"⁵⁴Mn"},
{"Z":26,"Element":"Fe","Known":28,"Stable":4,"Unstable":24,"Predicted":66,"Gap":38,"Gamma_keV":null,"NIST_Kalpha1_keV":6.404,"Context":"Fe Kα₁"},
{"Z":27,"Element":"Co","Known":29,"Stable":1,"Unstable":28,"Predicted":69,"Gap":40,"Gamma_keV":[1173.2,1332.5],"NIST_Kalpha1_keV":6.930,"Context":"⁶⁰Co γ"},
{"Z":28,"Element":"Ni","Known":31,"Stable":5,"Unstable":26,"Predicted":74,"Gap":43,"Gamma_keV":null,"NIST_Kalpha1_keV":7.478,"Context":"Ni Kα₁"},
{"Z":29,"Element":"Cu","Known":29,"Stable":2,"Unstable":27,"Predicted":69,"Gap":40,"Gamma_keV":null,"NIST_Kalpha1_keV":8.048,"Context":"Cu Kα₁"},
{"Z":30,"Element":"Zn","Known":30,"Stable":5,"Unstable":25,"Predicted":71,"Gap":41,"Gamma_keV":[1115.5],"NIST_Kalpha1_keV":8.638,"Context":"⁶⁵Zn"},
{"Z":31,"Element":"Ga","Known":31,"Stable":2,"Unstable":29,"Predicted":74,"Gap":43,"Gamma_keV":[93.3,184.6,300.2],"NIST_Kalpha1_keV":9.251,"Context":"⁶⁷Ga"},
{"Z":32,"Element":"Ge","Known":32,"Stable":5,"Unstable":27,"Predicted":76,"Gap":44,"Gamma_keV":null,"NIST_Kalpha1_keV":9.886,"Context":"Ge Kα₁"},
{"Z":33,"Element":"As","Known":33,"Stable":1,"Unstable":32,"Predicted":78,"Gap":45,"Gamma_keV":[559.1,595.9],"NIST_Kalpha1_keV":10.543,"Context":"⁷⁴As"},
{"Z":34,"Element":"Se","Known":30,"Stable":6,"Unstable":24,"Predicted":71,"Gap":41,"Gamma_keV":[136.0,265.0,279.5],"NIST_Kalpha1_keV":11.222,"Context":"⁷⁵Se"},
{"Z":35,"Element":"Br","Known":31,"Stable":2,"Unstable":29,"Predicted":74,"Gap":43,"Gamma_keV":[554.3,776.5],"NIST_Kalpha1_keV":11.924,"Context":"⁸²Br"},
{"Z":36,"Element":"Kr","Known":32,"Stable":6,"Unstable":26,"Predicted":76,"Gap":44,"Gamma_keV":[514.0],"NIST_Kalpha1_keV":12.648,"Context":"⁸⁵Kr"},
{"Z":37,"Element":"Rb","Known":32,"Stable":1,"Unstable":31,"Predicted":76,"Gap":44,"Gamma_keV":[511.0],"NIST_Kalpha1_keV":13.395,"Context":"⁸²Rb PET"},
{"Z":38,"Element":"Sr","Known":34,"Stable":4,"Unstable":30,"Predicted":81,"Gap":47,"Gamma_keV":[514.0],"NIST_Kalpha1_keV":14.165,"Context":"⁸⁵Sr"},
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{"Z":40,"Element":"Zr","Known":34,"Stable":5,"Unstable":29,"Predicted":81,"Gap":47,"Gamma_keV":[724.2],"NIST_Kalpha1_keV":15.775,"Context":"⁹⁵Zr"},
{"Z":41,"Element":"Nb","Known":34,"Stable":1,"Unstable":33,"Predicted":81,"Gap":47,"Gamma_keV":[765.8],"NIST_Kalpha1_keV":16.615,"Context":"⁹⁵Nb"},
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{"Z":44,"Element":"Ru","Known":37,"Stable":7,"Unstable":30,"Predicted":88,"Gap":51,"Gamma_keV":[497.1],"NIST_Kalpha1_keV":19.279,"Context":"¹⁰³Ru"},
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{"Z":46,"Element":"Pd","Known":36,"Stable":6,"Unstable":30,"Predicted":85,"Gap":49,"Gamma_keV":null,"NIST_Kalpha1_keV":21.176,"Context":"stable; XRF"},
{"Z":47,"Element":"Ag","Known":38,"Stable":2,"Unstable":36,"Predicted":90,"Gap":52,"Gamma_keV":[657.8],"NIST_Kalpha1_keV":22.163,"Context":"¹¹⁰ᵐAg"},
{"Z":48,"Element":"Cd","Known":39,"Stable":8,"Unstable":31,"Predicted":93,"Gap":54,"Gamma_keV":[88.0],"NIST_Kalpha1_keV":23.173,"Context":"¹⁰⁹Cd"},
{"Z":49,"Element":"In","Known":39,"Stable":2,"Unstable":37,"Predicted":93,"Gap":54,"Gamma_keV":[171.3,245.4],"NIST_Kalpha1_keV":24.209,"Context":"¹¹¹In"},
{"Z":50,"Element":"Sn","Known":40,"Stable":10,"Unstable":30,"Predicted":95,"Gap":55,"Gamma_keV":[391.7],"NIST_Kalpha1_keV":25.271,"Context":"¹¹³Sn"},
{"Z":51,"Element":"Sb","Known":36,"Stable":2,"Unstable":34,"Predicted":85,"Gap":49,"Gamma_keV":[602.7,1691.0],"NIST_Kalpha1_keV":26.359,"Context":"¹²⁴Sb"},
{"Z":52,"Element":"Te","Known":38,"Stable":8,"Unstable":30,"Predicted":90,"Gap":52,"Gamma_keV":[159.0],"NIST_Kalpha1_keV":27.472,"Context":"¹²³ᵐTe"},
{"Z":53,"Element":"I","Known":37,"Stable":1,"Unstable":36,"Predicted":88,"Gap":51,"Gamma_keV":[364.5],"NIST_Kalpha1_keV":28.612,"Context":"¹³¹I"},
{"Z":54,"Element":"Xe","Known":40,"Stable":9,"Unstable":31,"Predicted":95,"Gap":55,"Gamma_keV":[81.0],"NIST_Kalpha1_keV":29.779,"Context":"¹³³Xe"},
{"Z":55,"Element":"Cs","Known":39,"Stable":1,"Unstable":38,"Predicted":93,"Gap":54,"Gamma_keV":[661.7],"NIST_Kalpha1_keV":30.973,"Context":"¹³⁷Cs"},
{"Z":56,"Element":"Ba","Known":40,"Stable":7,"Unstable":33,"Predicted":95,"Gap":55,"Gamma_keV":[356.0],"NIST_Kalpha1_keV":32.193,"Context":"¹³³Ba"},
{"Z":57,"Element":"La","Known":39,"Stable":1,"Unstable":38,"Predicted":93,"Gap":54,"Gamma_keV":[1596.5],"NIST_Kalpha1_keV":33.442,"Context":"¹⁴⁰La"},
{"Z":58,"Element":"Ce","Known":40,"Stable":4,"Unstable":36,"Predicted":95,"Gap":55,"Gamma_keV":[145.4],"NIST_Kalpha1_keV":34.717,"Context":"¹⁴¹Ce"},
{"Z":59,"Element":"Pr","Known":39,"Stable":1,"Unstable":38,"Predicted":93,"Gap":54,"Gamma_keV":null,"NIST_Kalpha1_keV":36.019,"Context":"stable; XRF"},
{"Z":60,"Element":"Nd","Known":41,"Stable":5,"Unstable":36,"Predicted":97,"Gap":56,"Gamma_keV":[531.0],"NIST_Kalpha1_keV":37.349,"Context":"¹⁴⁷Nd"},
{"Z":61,"Element":"Pm","Known":39,"Stable":0,"Unstable":39,"Predicted":93,"Gap":54,"Gamma_keV":null,"NIST_Kalpha1_keV":38.707,"Context":"no stable isotopes"},
{"Z":62,"Element":"Sm","Known":41,"Stable":7,"Unstable":34,"Predicted":97,"Gap":56,"Gamma_keV":[333.0],"NIST_Kalpha1_keV":40.093,"Context":"¹⁵³Sm"},
{"Z":63,"Element":"Eu","Known":40,"Stable":2,"Unstable":38,"Predicted":95,"Gap":55,"Gamma_keV":[121.8,344.3],"NIST_Kalpha1_keV":41.507,"Context":"¹⁵²Eu"},
{"Z":64,"Element":"Gd","Known":41,"Stable":7,"Unstable":34,"Predicted":97,"Gap":56,"Gamma_keV":[103.2],"NIST_Kalpha1_keV":42.950,"Context":"¹⁵³Gd"},
{"Z":65,"Element":"Tb","Known":39,"Stable":1,"Unstable":38,"Predicted":93,"Gap":54,"Gamma_keV":[298.6],"NIST_Kalpha1_keV":44.422,"Context":"¹⁶⁰Tb"},
{"Z":66,"Element":"Dy","Known":40,"Stable":7,"Unstable":33,"Predicted":95,"Gap":55,"Gamma_keV":null,"NIST_Kalpha1_keV":45.924,"Context":"stable; XRF"},
{"Z":67,"Element":"Ho","Known":39,"Stable":1,"Unstable":38,"Predicted":93,"Gap":54,"Gamma_keV":[133.0],"NIST_Kalpha1_keV":47.456,"Context":"¹⁶⁶Ho"},
{"Z":68,"Element":"Er","Known":40,"Stable":6,"Unstable":34,"Predicted":95,"Gap":55,"Gamma_keV":null,"NIST_Kalpha1_keV":49.017,"Context":"stable; XRF"},
{"Z":69,"Element":"Tm","Known":39,"Stable":1,"Unstable":38,"Predicted":93,"Gap":54,"Gamma_keV":[88.0],"NIST_Kalpha1_keV":50.609,"Context":"¹⁷⁰Tm"},
{"Z":70,"Element":"Yb","Known":41,"Stable":7,"Unstable":34,"Predicted":97,"Gap":56,"Gamma_keV":null,"NIST_Kalpha1_keV":52.231,"Context":"stable; XRF"},
{"Z":71,"Element":"Lu","Known":40,"Stable":1,"Unstable":39,"Predicted":95,"Gap":55,"Gamma_keV":[113.0,208.4],"NIST_Kalpha1_keV":53.884,"Context":"¹⁷⁷Lu"},
{"Z":72,"Element":"Hf","Known":36,"Stable":5,"Unstable":31,"Predicted":85,"Gap":49,"Gamma_keV":[482.2],"NIST_Kalpha1_keV":55.568,"Context":"¹⁸¹Hf"},
{"Z":73,"Element":"Ta","Known":37,"Stable":1,"Unstable":36,"Predicted":88,"Gap":51,"Gamma_keV":[67.7,1221.4,1231.0],"NIST_Kalpha1_keV":57.284,"Context":"¹⁸²Ta"},
{"Z":74,"Element":"W","Known":35,"Stable":5,"Unstable":30,"Predicted":83,"Gap":48,"Gamma_keV":[685.8],"NIST_Kalpha1_keV":59.318,"Context":"¹⁸⁷W"},
{"Z":75,"Element":"Re","Known":39,"Stable":1,"Unstable":38,"Predicted":93,"Gap":54,"Gamma_keV":[137.2],"NIST_Kalpha1_keV":61.140,"Context":"¹⁸⁶Re"},
{"Z":76,"Element":"Os","Known":35,"Stable":7,"Unstable":28,"Predicted":83,"Gap":48,"Gamma_keV":[129.4],"NIST_Kalpha1_keV":63.087,"Context":"stable; XRF"},
{"Z":77,"Element":"Ir","Known":34,"Stable":2,"Unstable":32,"Predicted":81,"Gap":47,"Gamma_keV":[316.5,468.1,604.7],"NIST_Kalpha1_keV":65.145,"Context":"¹⁹²Ir"},
{"Z":78,"Element":"Pt","Known":35,"Stable":6,"Unstable":29,"Predicted":83,"Gap":48,"Gamma_keV":[99.0],"NIST_Kalpha1_keV":66.832,"Context":"¹⁹⁵ᵐPt"},
{"Z":79,"Element":"Au","Known":36,"Stable":1,"Unstable":35,"Predicted":85,"Gap":49,"Gamma_keV":[411.8],"NIST_Kalpha1_keV":68.804,"Context":"¹⁹⁸Au"},
{"Z":80,"Element":"Hg","Known":38,"Stable":7,"Unstable":31,"Predicted":90,"Gap":52,"Gamma_keV":[279.2],"NIST_Kalpha1_keV":70.819,"Context":"²⁰³Hg"},
{"Z":81,"Element":"Tl","Known":39,"Stable":2,"Unstable":37,"Predicted":93,"Gap":54,"Gamma_keV":[2614.5],"NIST_Kalpha1_keV":72.871,"Context":"²⁰⁸Tl"},
{"Z":82,"Element":"Pb","Known":43,"Stable":4,"Unstable":39,"Predicted":102,"Gap":59,"Gamma_keV":[351.9,46.5],"NIST_Kalpha1_keV":74.969,"Context":"²¹⁴Pb/²¹⁰Pb"},
{"Z":83,"Element":"Bi","Known":41,"Stable":0,"Unstable":41,"Predicted":97,"Gap":56,"Gamma_keV":[609.3,1120.3,1764.5],"NIST_Kalpha1_keV":77.107,"Context":"²¹⁴Bi"},
{"Z":84,"Element":"Po","Known":42,"Stable":0,"Unstable":42,"Predicted":100,"Gap":58,"Gamma_keV":null,"NIST_Kalpha1_keV":79.292,"Context":"α emitter; XRF"},
{"Z":85,"Element":"At","Known":39,"Stable":0,"Unstable":39,"Predicted":93,"Gap":54,"Gamma_keV":null,"NIST_Kalpha1_keV":81.580,"Context":"short-lived α"},
{"Z":86,"Element":"Rn","Known":39,"Stable":0,"Unstable":39,"Predicted":93,"Gap":54,"Gamma_keV":[609.3,1764.5],"NIST_Kalpha1_keV":83.900,"Context":"daughters γ; noble gas"},
{"Z":87,"Element":"Fr","Known":34,"Stable":0,"Unstable":34,"Predicted":81,"Gap":47,"Gamma_keV":null,"NIST_Kalpha1_keV":86.300,"Context":"short-lived"},
{"Z":88,"Element":"Ra","Known":34,"Stable":0,"Unstable":34,"Predicted":81,"Gap":47,"Gamma_keV":[186.2],"NIST_Kalpha1_keV":88.800,"Context":"²²⁶Ra"},
{"Z":89,"Element":"Ac","Known":33,"Stable":0,"Unstable":33,"Predicted":78,"Gap":45,"Gamma_keV":[911.2],"NIST_Kalpha1_keV":91.400,"Context":"²²⁸Ac"},
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{"Z":93,"Element":"Np","Known":20,"Stable":0,"Unstable":20,"Predicted":47,"Gap":27,"Gamma_keV":[106.1],"NIST_Kalpha1_keV":null,"Context":"synthetic"},
{"Z":94,"Element":"Pu","Known":20,"Stable":0,"Unstable":20,"Predicted":47,"Gap":27,"Gamma_keV":[375.0,51.6],"NIST_Kalpha1_keV":null,"Context":"²³⁹Pu/²⁴¹Pu"},
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{"Z":97,"Element":"Bk","Known":21,"Stable":0,"Unstable":21,"Predicted":50,"Gap":29,"Gamma_keV":null,"NIST_Kalpha1_keV":null,"Context":"synthetic"},
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]
If you also want a CSV or a version with frequencies (Hz) computed for every energy, I can produce that immediately.