{"query": "Iron (Fe) — element 26", "count": 20, "results": [{"id": "card_ref_el_026", "title": "Iron (Fe) — element 26", "shelf": "chemistry", "surface": "secular", "snippet": "Atomic number 26. Symbol Fe. Standard atomic weight 55.845. The iron atom carries 26 protons in its nucleus; its place in the periodic table is fixed by that count. Verified reference data.", "authority_tier": "reference", "source": "Verified reference — chemistry", "generated": false}, {"id": "card_domchk_periodic_table_claimed_name", "title": "Periodic Table: name", "shelf": "periodic_table", "surface": "secular", "snippet": "A worked check in periodic table: name.\n\nGIVEN\n  symbol = Fe\n\nCLAIMED\n  claimed_name = iron\n\nTHE ENGINE'S VERDICT\n  periodic_table.element: CONFIRMED — Fe (iron, Z=26) — definitional claims match\n\nAND", "authority_tier": "reference", "source": "The verifier's own documented relation, and a run this engine performed against it (deterministic; re-runnable with tools/domain_goldens.py)", "generated": false}, {"id": "card_src_nuclide_fe_54", "title": "Fe-54 — fe-54", "shelf": "nuclear_physics", "surface": "secular", "snippet": "Nuclide Fe-54: 26 protons, 28 neutrons, mass number A=54. Stable. Natural abundance 0.058449999999999995. Atomic mass 53.939608 u.", "authority_tier": "reference", "source": "NNDC / AME nuclide data (public domain)", "generated": false}, {"id": "card_src_nuclide_fe_56", "title": "Fe-56 — fe-56", "shelf": "nuclear_physics", "surface": "secular", "snippet": "Nuclide Fe-56: 26 protons, 30 neutrons, mass number A=56. Stable. Natural abundance 0.91754. Atomic mass 55.934936 u.", "authority_tier": "reference", "source": "NNDC / AME nuclide data (public domain)", "generated": false}, {"id": "card_src_nuclide_fe_57", "title": "Fe-57 — fe-57", "shelf": "nuclear_physics", "surface": "secular", "snippet": "Nuclide Fe-57: 26 protons, 31 neutrons, mass number A=57. Stable. Natural abundance 0.02119. Atomic mass 56.935392 u.", "authority_tier": "reference", "source": "NNDC / AME nuclide data (public domain)", "generated": false}, {"id": "card_src_nuclide_fe_58", "title": "Fe-58 — fe-58", "shelf": "nuclear_physics", "surface": "secular", "snippet": "Nuclide Fe-58: 26 protons, 32 neutrons, mass number A=58. Stable. Natural abundance 0.0028199999999999996. Atomic mass 57.933274 u.", "authority_tier": "reference", "source": "NNDC / AME nuclide data (public domain)", "generated": false}, {"id": "card_src_nuclide_fe_76", "title": "Fe-76 — fe-76", "shelf": "nuclear_physics", "surface": "secular", "snippet": "Nuclide Fe-76: 26 protons, 50 neutrons, mass number A=76. Unstable. Primary decay: B- 1%. Atomic mass 75.988631 u.", "authority_tier": "reference", "source": "NNDC / AME nuclide data (public domain)", "generated": false}, {"id": "card_src_nuclide_fe_45", "title": "Fe-45 — fe-45", "shelf": "nuclear_physics", "surface": "secular", "snippet": "Nuclide Fe-45: 26 protons, 19 neutrons, mass number A=45. Half-life 0.00189 s. Primary decay: 2P 0.57%. Atomic mass 45.015467 u.", "authority_tier": "reference", "source": "NNDC / AME nuclide data (public domain)", "generated": false}, {"id": "card_src_nuclide_fe_59", "title": "Fe-59 — fe-59", "shelf": "nuclear_physics", "surface": "secular", "snippet": "Nuclide Fe-59: 26 protons, 33 neutrons, mass number A=59. Half-life 3843936.0 s. Primary decay: B- 1%. Atomic mass 58.934873 u.", "authority_tier": "reference", "source": "NNDC / AME nuclide data (public domain)", "generated": false}, {"id": "card_src_nuclide_fe_60", "title": "Fe-60 — fe-60", "shelf": "nuclear_physics", "surface": "secular", "snippet": "Nuclide Fe-60: 26 protons, 34 neutrons, mass number A=60. Half-life 82679146053431.1 s. Primary decay: B- 1%. Atomic mass 59.934070 u.", "authority_tier": "reference", "source": "NNDC / AME nuclide data (public domain)", "generated": false}, {"id": "card_src_nuclide_fe_61", "title": "Fe-61 — fe-61", "shelf": "nuclear_physics", "surface": "secular", "snippet": "Nuclide Fe-61: 26 protons, 35 neutrons, mass number A=61. Half-life 358.8 s. Primary decay: B- 1%. Atomic mass 60.936746 u.", "authority_tier": "reference", "source": "NNDC / AME nuclide data (public domain)", "generated": false}, {"id": "card_src_nuclide_fe_62", "title": "Fe-62 — fe-62", "shelf": "nuclear_physics", "surface": "secular", "snippet": "Nuclide Fe-62: 26 protons, 36 neutrons, mass number A=62. Half-life 68.0 s. Primary decay: B- 1%. Atomic mass 61.936792 u.", "authority_tier": "reference", "source": "NNDC / AME nuclide data (public domain)", "generated": false}, {"id": "card_src_nuclide_fe_63", "title": "Fe-63 — fe-63", "shelf": "nuclear_physics", "surface": "secular", "snippet": "Nuclide Fe-63: 26 protons, 37 neutrons, mass number A=63. Half-life 6.1 s. Primary decay: B- 1%. Atomic mass 62.940273 u.", "authority_tier": "reference", "source": "NNDC / AME nuclide data (public domain)", "generated": false}, {"id": "card_src_nuclide_fe_64", "title": "Fe-64 — fe-64", "shelf": "nuclear_physics", "surface": "secular", "snippet": "Nuclide Fe-64: 26 protons, 38 neutrons, mass number A=64. Half-life 2.0 s. Primary decay: B- 1%. Atomic mass 63.940988 u.", "authority_tier": "reference", "source": "NNDC / AME nuclide data (public domain)", "generated": false}, {"id": "card_src_nuclide_fe_65", "title": "Fe-65 — fe-65", "shelf": "nuclear_physics", "surface": "secular", "snippet": "Nuclide Fe-65: 26 protons, 39 neutrons, mass number A=65. Half-life 0.81 s. Primary decay: B- 1%. Atomic mass 64.945015 u.", "authority_tier": "reference", "source": "NNDC / AME nuclide data (public domain)", "generated": false}, {"id": "card_src_nuclide_fe_66", "title": "Fe-66 — fe-66", "shelf": "nuclear_physics", "surface": "secular", "snippet": "Nuclide Fe-66: 26 protons, 40 neutrons, mass number A=66. Half-life 0.44 s. Primary decay: B- 1%. Atomic mass 65.946250 u.", "authority_tier": "reference", "source": "NNDC / AME nuclide data (public domain)", "generated": false}, {"id": "card_src_nuclide_fe_67", "title": "Fe-67 — fe-67", "shelf": "nuclear_physics", "surface": "secular", "snippet": "Nuclide Fe-67: 26 protons, 41 neutrons, mass number A=67. Half-life 0.6 s. Primary decay: B- 1%. Atomic mass 66.950930 u.", "authority_tier": "reference", "source": "NNDC / AME nuclide data (public domain)", "generated": false}, {"id": "card_src_nuclide_fe_68", "title": "Fe-68 — fe-68", "shelf": "nuclear_physics", "surface": "secular", "snippet": "Nuclide Fe-68: 26 protons, 42 neutrons, mass number A=68. Half-life 0.188 s. Primary decay: B- 1%. Atomic mass 67.952875 u.", "authority_tier": "reference", "source": "NNDC / AME nuclide data (public domain)", "generated": false}, {"id": "card_src_nuclide_fe_69", "title": "Fe-69 — fe-69", "shelf": "nuclear_physics", "surface": "secular", "snippet": "Nuclide Fe-69: 26 protons, 43 neutrons, mass number A=69. Half-life 0.11 s. Primary decay: B- 1%. Atomic mass 68.957918 u.", "authority_tier": "reference", "source": "NNDC / AME nuclide data (public domain)", "generated": false}, {"id": "card_src_nuclide_fe_70", "title": "Fe-70 — fe-70", "shelf": "nuclear_physics", "surface": "secular", "snippet": "Nuclide Fe-70: 26 protons, 44 neutrons, mass number A=70. Half-life 0.065 s. Primary decay: B- 1%. Atomic mass 69.960397 u.", "authority_tier": "reference", "source": "NNDC / AME nuclide data (public domain)", "generated": false}]}