{"query": "Hydrogen (H) — element 1", "count": 20, "results": [{"id": "card_ref_el_001", "title": "Hydrogen (H) — element 1", "shelf": "chemistry", "surface": "secular", "snippet": "Atomic number 1. Symbol H. Standard atomic weight 1.008. The hydrogen atom carries 1 proton 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_theory_stellar_nucleosynthesis_the_hr_diagram", "title": "Stellar nucleosynthesis & the HR diagram", "shelf": "theories", "surface": "secular", "snippet": "Stellar nucleosynthesis & the HR diagram — an engine domain that can touch it: astronomy. Calibration: partial — specific relations verify; the theory as a whole is not a sealable computation. Where t", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_bohr_quantum_model_of_the_atom", "title": "Bohr / quantum model of the atom", "shelf": "theories", "surface": "secular", "snippet": "Bohr / quantum model of the atom — an engine domain that can touch it: atomic. Calibration: seals — energy levels and shell capacities compute. Electrons occupy discrete orbits with QUANTISED energies", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_nuclear_decay_binding_energy", "title": "Nuclear decay & binding energy", "shelf": "theories", "surface": "secular", "snippet": "Nuclear decay & binding energy — an engine domain that can touch it: nuclear_physics. Calibration: seals — half-lives, decay chains and mass-energy conversions compute. An unstable nucleus decays with", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_dna_structure", "title": "The double helix (structure that explains its own copying)", "shelf": "theories", "surface": "secular", "snippet": "The double helix (structure that explains its own copying) — an engine domain that can touch it: genetics. Calibration: seals — base-pair ratios, melting temperatures and complement sequences compute.", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_br_nsted_lowry_acid_base_theory_ph", "title": "Brønsted–Lowry acid–base theory & pH", "shelf": "theories", "surface": "secular", "snippet": "Brønsted–Lowry acid–base theory & pH — an engine domain that can touch it: chemistry. Calibration: seals — pH, pKa and buffer calculations compute exactly. An acid DONATES a proton, a base ACCEPTS one", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_src_fed_nasa_techdoc_19970033338", "title": "Safety Standard for Hydrogen and Hydrogen Systems: Guidelines for Hydrogen System Design, Materials Selection, Operations, Storage and Transportation", "shelf": "science", "surface": "secular", "snippet": "Safety Standard for Hydrogen and Hydrogen Systems: Guidelines for Hydrogen System Design, Materials Selection, Operations, Storage and Transportation. A United States federal publication, public domai", "authority_tier": "reference", "source": "NASA technical documents (PD, 17 USC 105)", "generated": false}, {"id": "card_src_word_hydrogen_ion", "title": "hydrogen ion", "shelf": "dictionary", "surface": "secular", "snippet": "hydrogen ion: (noun) a positively charged atom of hydrogen; that is to say, a normal hydrogen atomic nucleus", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_acid_hydrogen", "title": "acid hydrogen", "shelf": "dictionary", "surface": "secular", "snippet": "acid hydrogen: (noun) a hydrogen atom in an acid that forms a positive ion when the acid dissociates — syn: acidic hydrogen", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_acidic_hydrogen", "title": "acidic hydrogen", "shelf": "dictionary", "surface": "secular", "snippet": "acidic hydrogen: (noun) a hydrogen atom in an acid that forms a positive ion when the acid dissociates — syn: acid hydrogen", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_heavy_hydrogen", "title": "heavy hydrogen", "shelf": "dictionary", "surface": "secular", "snippet": "heavy hydrogen: (noun) an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen) — syn: deuterium", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_pron_hydrogens", "title": "hydrogens", "shelf": "pronunciation", "surface": "secular", "snippet": "hydrogens: pronounced (ARPABET) HH AY1 D R AH0 JH AH0 N Z. From the CMU Pronouncing Dictionary — the standard machine-readable pronunciations of North American English.", "authority_tier": "reference", "source": "CMU Pronouncing Dictionary (cmudict) — BSD-2-Clause, Carnegie Mellon", "generated": false}, {"id": "card_src_word_hydrogen", "title": "hydrogen", "shelf": "dictionary", "surface": "secular", "snippet": "hydrogen: (noun) a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe — syn: H, ", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_hydrogen_atom", "title": "hydrogen atom", "shelf": "dictionary", "surface": "secular", "snippet": "hydrogen atom: (noun) an atom of hydrogen", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_drug_hydrogen_peroxide_3_0", "title": "Hydrogen Peroxide 3.0%", "shelf": "medicine", "surface": "secular", "snippet": "Hydrogen Peroxide 3.0%: a HUMAN OTC DRUG, spray given by the topical route.", "authority_tier": "reference", "source": "openFDA / FDA NDC Directory (public domain)", "generated": false}, {"id": "card_src_drug_hydrogen_peroxide_3", "title": "Hydrogen Peroxide 3%", "shelf": "medicine", "surface": "secular", "snippet": "Hydrogen Peroxide 3%: a HUMAN OTC DRUG, liquid given by the topical route.", "authority_tier": "reference", "source": "openFDA / FDA NDC Directory (public domain)", "generated": false}, {"id": "card_src_drug_1169_hydrogen_peroxide_spray", "title": "1169 Hydrogen Peroxide Spray", "shelf": "medicine", "surface": "secular", "snippet": "1169 Hydrogen Peroxide Spray: a HUMAN OTC DRUG, spray given by the topical route.", "authority_tier": "reference", "source": "openFDA / FDA NDC Directory (public domain)", "generated": false}, {"id": "card_src_word_hydrogen_ion_concentration", "title": "hydrogen ion concentration", "shelf": "dictionary", "surface": "secular", "snippet": "hydrogen ion concentration: (noun) the number of moles of hydrogen ions per cubic decimeter", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_drug_wish_hydrogen_peroxide_3", "title": "Wish Hydrogen Peroxide 3%", "shelf": "medicine", "surface": "secular", "snippet": "WISH HYDROGEN PEROXIDE 3%: a HUMAN OTC DRUG, liquid given by the topical route.", "authority_tier": "reference", "source": "openFDA / FDA NDC Directory (public domain)", "generated": false}, {"id": "card_src_word_hydrogen_carbonate", "title": "hydrogen carbonate", "shelf": "dictionary", "surface": "secular", "snippet": "hydrogen carbonate: (noun) a salt of carbonic acid (containing the anion HCO3) in which one hydrogen atom has been replaced; an acid carbonate — syn: bicarbonate", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}]}