{"query": "Potassium (K) — element 19", "count": 20, "results": [{"id": "card_ref_el_019", "title": "Potassium (K) — element 19", "shelf": "chemistry", "surface": "secular", "snippet": "Atomic number 19. Symbol K. Standard atomic weight 39.0983. The potassium atom carries 19 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", "readable": false, "generated": false}, {"id": "card_theory_nutrient_cycling_agronomy", "title": "Nutrient cycling & agronomy (NPK, evapotranspiration)", "shelf": "theories", "surface": "secular", "snippet": "Nutrient cycling & agronomy (NPK, evapotranspiration) — an engine domain that can touch it: soil_science. Calibration: seals — nutrient budgets and ET rates compute. Elements cycle between soil, plant", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_law_of_the_minimum", "title": "Liebig's law of the minimum (what actually limits growth)", "shelf": "theories", "surface": "secular", "snippet": "Liebig's law of the minimum (what actually limits growth) — an engine domain that can touch it: soil_science. Calibration: seals — nutrient ratios and deficiency thresholds compute. Growth is limited ", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_neuroscience", "title": "Neurons & the action potential (how a nerve carries a signal)", "shelf": "theories", "surface": "secular", "snippet": "Neurons & the action potential (how a nerve carries a signal) — an engine domain that can touch it: medicine. Calibration: seals — conduction velocities, membrane potentials and Nernst equilibria comp", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_food_soil", "title": "Feed the soil, not just the plant", "shelf": "agriculture", "surface": "secular", "snippet": "Healthy soil grows healthy food; poor soil grows failure. Build it with ORGANIC MATTER — compost, aged manure, leaf mold, cover crops turned in — which feeds soil life, holds water, and releases nutri", "authority_tier": "reference", "source": "USDA Farmers' Bulletins & extension guidance (U.S. government, public domain)", "readable": false, "generated": false}, {"id": "card_span_edf3b9c81714", "title": "When the liquid will drop in a continuous thread from the stirrer", "shelf": "sources", "surface": "secular", "snippet": "When  the  liquid  will  drop  in  a  continuous  thread  from \nthe  stirrer,  and  jellifies  on  cooling,  it  is  ready  for  the \n^^  cutting\"  process.  This  consists  in  throwing  in  salt  by", "authority_tier": "primary_pd", "source": "A treatise on chemistry applied to the manufacture of soap and candles; being a thorough exposition, in all their minuti", "readable": true, "generated": false}, {"id": "card_src_openstax_biology_ap_courses_review_questions_82e1eb46", "title": "Review Questions — Biology for AP® Courses", "shelf": "biology", "surface": "secular", "snippet": "Review Questions\n\n1\n.\n\nWhat is the term for atoms of the same element that vary in the number of neutrons in their nuclei?\n\nions\n\nisotopes\n\nisobars\n\nneutral atoms\n\n2\n.\n\nPotassium has an atomic number ", "authority_tier": "reference", "source": "OpenStax: Biology for AP® Courses (CC-BY 4.0)", "readable": false, "generated": false}, {"id": "card_src_word_potassium", "title": "potassium", "shelf": "dictionary", "surface": "secular", "snippet": "potassium: (noun) a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in se", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_etym_potassium", "title": "potassium", "shelf": "etymology", "surface": "secular", "snippet": "potassium: etymology (Webster 1913) — n.: [NL. See Potassa, Potash.]. From Webster's Revised Unabridged Dictionary (1913), public domain.", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_src_word_atomic_number_19", "title": "atomic number 19", "shelf": "dictionary", "surface": "secular", "snippet": "atomic number 19: (noun) a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurrin", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_etym_chromium", "title": "chromium", "shelf": "etymology", "surface": "secular", "snippet": "chromium: etymology (Webster 1913) — n.: [NL., fr. Gr. (Chem.) Defn: A comparatively rare element occurring most abundantly in the mineral chromite. Atomic weight 52.5. Symbol Cr. When isolated it is ", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_src_word_k", "title": "k", "shelf": "dictionary", "surface": "secular", "snippet": "k: (noun) the basic unit of thermodynamic temperature adopted under the Systeme International d'Unites — syn: kelvin · (noun) a light soft silver-white metallic element of the alkali metal group; oxid", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_etym_tartar", "title": "tartar", "shelf": "etymology", "surface": "secular", "snippet": "tartar: etymology (Webster 1913) — n.: [F. tartre (cf. Pr. tartari, Sp., Pg., & It. tartaro, LL. tartarum, LGr. 1. (Chem.) Defn: A reddish crust or sediment in wine casks, consisting essentially of cr", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_src_etym_potassamide", "title": "potassamide", "shelf": "etymology", "surface": "secular", "snippet": "potassamide: etymology (Webster 1913) — n.: [Potassium + amide.]. From Webster's Revised Unabridged Dictionary (1913), public domain.", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_src_etym_potassoxyl", "title": "potassoxyl", "shelf": "etymology", "surface": "secular", "snippet": "potassoxyl: etymology (Webster 1913) — n.: [Potassium + oxygen + -yl.]. From Webster's Revised Unabridged Dictionary (1913), public domain.", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_src_etym_sylvine_sylvite", "title": "sylvine; sylvite", "shelf": "etymology", "surface": "secular", "snippet": "sylvine; sylvite: etymology (Webster 1913) — n.: [So called from NL. sal digestivus sylvii potassium chloride.]. From Webster's Revised Unabridged Dictionary (1913), public domain.", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_src_etym_kainite", "title": "kainite", "shelf": "etymology", "surface": "secular", "snippet": "kainite: etymology (Webster 1913) — n.: [Gr. (Min.) Defn: A compound salt consisting chiefly of potassium chloride and magnesium sulphate, occurring at the Stassfurt salt mines in Prussian Saxony.]. F", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_src_etym_chromatype", "title": "chromatype", "shelf": "etymology", "surface": "secular", "snippet": "chromatype: etymology (Webster 1913) — n.: [Gr. 1. (Photog.) Defn: A colored photographic picture taken upon paper made sensitive with potassium bichromate or some other salt of chromium. 2. The proce", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_src_etym_stryphnic", "title": "stryphnic", "shelf": "etymology", "surface": "secular", "snippet": "stryphnic: etymology (Webster 1913) — a.: [Gr. (Chem.) Defn: Pertaining to, or designating, a complex nitrogenous acid, obtained by the action of acetic acid and potassium nitrite on uric acid, as a y", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_src_etym_apophyllite", "title": "apophyllite", "shelf": "etymology", "surface": "secular", "snippet": "apophyllite: etymology (Webster 1913) — n.: [Pref. apo- + Gr. (Min.) Defn: A mineral relating to the zeolites, usually occurring in square prisms or octahedrons with pearly luster on the cleavage surf", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}], "house": {"door": "FIND", "kind": "cards", "trail": "results", "seal": null, "next_step": {"do": "open the top card", "door": "FIND", "tool": "card_get", "params": {"id": "card_ref_el_019"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}