Polyatomics

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type Ion = { name: string; formula: string; charge: string; category: string };\nexport type QuizMode = \"formula\" | \"name\";\nexport type Config = { mode: QuizMode; seconds: number | null; categories: string[]; ions: string[]; loop: boolean };\nexport type Attempt = { correct: boolean; ion: Ion; timeLeft: number | null };\n\nexport const IONS: Ion[] = [\n { name: \"acetate\", formula: \"C2H3O2\", charge: \"−1\", category: \"Common\" },\n { name: \"ammonium\", formula: \"NH4\", charge: \"+1\", category: \"Common\" },\n { name: \"bicarbonate\", formula: \"HCO3\", charge: \"−1\", category: \"Common\" },\n { name: \"bisulfate\", formula: \"HSO4\", charge: \"−1\", category: \"Common\" },\n { name: \"bisulfite\", formula: \"HSO3\", charge: \"−1\", category: \"Common\" },\n { name: \"borate\", formula: \"BO3\", charge: \"−3\", category: \"Oxyanion\" },\n { name: \"bromate\", formula: \"BrO3\", charge: \"−1\", category: \"Oxyanion\" },\n { name: \"bromite\", formula: \"BrO2\", charge: \"−1\", category: \"Oxyanion\" },\n { name: \"carbonate\", formula: \"CO3\", charge: \"−2\", category: \"Common\" },\n { name: \"chlorate\", formula: \"ClO3\", charge: \"−1\", category: \"Oxyanion\" },\n { name: \"chlorite\", formula: \"ClO2\", charge: \"−1\", category: \"Oxyanion\" },\n { name: \"chromate\", formula: \"CrO4\", charge: \"−2\", category: \"Oxyanion\" },\n { name: \"cyanide\", formula: \"CN\", charge: \"−1\", category: \"Common\" },\n { name: \"dichromate\", formula: \"Cr2O7\", charge: \"−2\", category: \"Oxyanion\" },\n { name: \"dihydrogen phosphate\", formula: \"H2PO4\", charge: \"−1\", category: \"Oxyanion\" },\n { name: \"hydrogen phosphate\", formula: \"HPO4\", charge: \"−2\", category: \"Oxyanion\" },\n { name: \"hydroxide\", formula: \"OH\", charge: \"−1\", category: \"Common\" },\n { name: \"hypochlorite\", formula: \"ClO\", charge: \"−1\", category: \"Oxyanion\" },\n { name: \"iodate\", formula: \"IO3\", charge: \"−1\", category: \"Oxyanion\" },\n { name: \"iodite\", formula: \"IO2\", charge: \"−1\", category: \"Oxyanion\" },\n { name: \"manganate\", formula: \"MnO4\", charge: \"−2\", category: \"Oxyanion\" },\n { name: \"nitrate\", formula: \"NO3\", charge: \"−1\", category: \"Common\" },\n { name: \"nitrite\", formula: \"NO2\", charge: \"−1\", category: \"Common\" },\n { name: \"oxalate\", formula: \"C2O4\", charge: \"−2\", category: \"Organic\" },\n { name: \"perchlorate\", formula: \"ClO4\", charge: \"−1\", category: \"Oxyanion\" },\n { name: \"permanganate\", formula: \"MnO4\", charge: \"−1\", category: \"Oxyanion\" },\n { name: \"peroxide\", formula: \"O2\", charge: \"−2\", category: \"Common\" },\n { name: \"phosphate\", formula: \"PO4\", charge: \"−3\", category: \"Common\" },\n { name: \"phosphite\", formula: \"PO3\", charge: \"−3\", category: \"Oxyanion\" },\n { name: \"silicate\", formula: \"SiO3\", charge: \"−2\", category: \"Oxyanion\" },\n { name: \"sulfate\", formula: \"SO4\", charge: \"−2\", category: \"Common\" },\n { name: \"sulfite\", formula: \"SO3\", charge: \"−2\", category: \"Common\" },\n { name: \"thiocyanate\", formula: \"SCN\", charge: \"−1\", category: \"Organic\" },\n { name: \"thiosulfate\", formula: \"S2O3\", charge: \"−2\", category: \"Oxyanion\" },\n];\n\nexport const CATEGORIES = [\"Common\", \"Oxyanion\", \"Organic\"] as const;\nexport const DEFAULT_CONFIG: Config = { mode: \"formula\", seconds: 120, categories: [\"Common\", \"Oxyanion\"], ions: [], loop: false };\n","deleted",false,"label",[57,58,35],"frontend","lib",{"_33":82,"_13":57,"_36":83,"_38":-5,"_40":41,"_42":78,"_44":45,"_46":84,"_17":85,"_49":86,"_51":-5,"_53":54,"_55":-5,"_70":87,"_18":88},{"_33":73,"_13":74,"_36":75,"_38":-5,"_40":41,"_42":76,"_44":45,"_46":77,"_17":78,"_49":24,"_51":79,"_53":54,"_55":-5,"_70":80,"_18":81},{"_33":62,"_13":63,"_36":64,"_38":-5,"_40":41,"_42":65,"_44":45,"_46":66,"_17":67,"_49":68,"_51":69,"_53":54,"_55":14,"_70":71,"_18":72},"e9eb1765-be20-45bc-b40c-2fe4c6e163d4","index.ts","01a04b7f-e043-776f-9b1e-67170ce79a7b",169,["D",1788037454141],9,"http","import { parseVal, serveImmutableFile } from \"https://esm.town/v/std/utils/index.ts\";\nimport { Hono } from \"npm:hono\";\nimport { Root } from \"./frontend/root.tsx\";\n\nconst app = new Hono();\n\napp.get(\"/\", (c) => c.html(Root()));\napp.get(\"/__immutable/*\", (c) => serveImmutableFile(c.req.path));\napp.get(\"/source\", (c) => c.redirect(parseVal().links.self.val));\napp.onError((err) => Promise.reject(err));\n\nexport default app.fetch;\n","children",[],[63],"8fd05197-c6e3-4b8e-b16a-e383aca59d99","README.md","01a04b7f-e043-776f-9b1e-61c237442125",146,["D",1788025063496],1,"# Polyatomics\n\nA focused practice app for memorizing common polyatomic ion formulas and charges.\n\n## Features\n\n- Practice 32 common polyatomic ions.\n- Choose a time limit or practice without a timer.\n- Practice by category or select individual ions.\n- Loop mode continuously cycles through the selected pool.\n- Immediate feedback shows the correct formula and charge.\n- Session results include accuracy, correct answers, average answer time, and missed ions.\n- Installable as a PWA with update notifications.\n\n## Architecture\n\n```mermaid\ngraph LR\n Browser -->|GET /| Hono[\"index.ts\"]\n Hono -->|HTML shell| Root[\"frontend/root.tsx\"]\n Root --> Entry[\"frontend/index.tsx\"]\n Entry --> App[\"frontend/components/App.tsx\"]\n App --> Start[\"StartScreen.tsx\"]\n App --> Quiz[\"QuizScreen.tsx\"]\n App --> End[\"EndScreen.tsx\"]\n App --> Install[\"InstallNudge.tsx\"]\n App --> Session[\"hooks/useQuizSession.ts\"]\n Session --> Rules[\"lib/quiz.ts\"]\n Rules --> Data[\"lib/polyatomics.ts\"]\n```\n\n## File structure\n\n```text\nindex.ts\nfrontend/\n root.tsx # HTML shell and immutable asset URLs\n index.tsx # React entrypoint and service-worker registration\n manifest.webmanifest # PWA metadata\n favicon.svg # App icon\n favicon-green.svg # App icon used by the shell\n icon-192.svg\n icon-512.svg\n components/\n App.tsx # Composition/root component\n StartScreen.tsx # Session configuration\n QuizScreen.tsx # Question and answer UI\n EndScreen.tsx # Session results\n InstallNudge.tsx # Install/update UI\n hooks/\n useQuizSession.ts # Quiz state and transitions\n lib/\n polyatomics.ts # Ion data, types, and defaults\n quiz.ts # Pure quiz rules and formatting helpers\n```\n\n## Design principles\n\nThe UI components are intentionally thin. Quiz behavior lives in `useQuizSession`, while pure domain rules live in `lib/quiz.ts`. The ion dataset and shared types live in `lib/polyatomics.ts`, so other practice modes can reuse them without depending on the UI.\n\nThe app does not require application cookies or a login to practice. Browser persistence for the install prompt is treated as optional: if web storage is unavailable or blocked, the prompt simply falls back to its default behavior and the quiz remains usable.\n\n## Development\n\nThe HTTP entrypoint is `index.ts`. React components live under `frontend/components/`, with reusable state and domain logic under `frontend/hooks/` and `frontend/lib/`.\n\nThe app uses React 18, Hono, Twind, and immutable Val Town asset URLs.\n",[],[74],"aa37af58-90fd-4bfa-85a4-500c985f1deb","01a04b7f-e043-776f-9b1e-58a885ba27e3",["D",1787973066715],0,"directory",[89,90,91,92,93,94,95],[57],{"_33":162,"_13":163,"_36":164,"_38":83,"_40":41,"_42":78,"_44":45,"_46":165,"_17":85,"_49":86,"_51":-5,"_53":54,"_55":-5,"_70":166,"_18":167},{"_33":146,"_13":147,"_36":148,"_38":83,"_40":41,"_42":129,"_44":45,"_46":149,"_17":85,"_49":86,"_51":-5,"_53":54,"_55":-5,"_70":150,"_18":151},{"_33":128,"_13":58,"_36":39,"_38":83,"_40":41,"_42":129,"_44":45,"_46":130,"_17":85,"_49":86,"_51":-5,"_53":54,"_55":-5,"_70":131,"_18":132},{"_33":120,"_13":121,"_36":122,"_38":83,"_40":41,"_42":123,"_44":45,"_46":124,"_17":78,"_49":24,"_51":125,"_53":54,"_55":-5,"_70":126,"_18":127},{"_33":113,"_13":114,"_36":115,"_38":83,"_40":41,"_42":78,"_44":45,"_46":116,"_17":85,"_49":24,"_51":117,"_53":54,"_55":-5,"_70":118,"_18":119},{"_33":105,"_13":106,"_36":107,"_38":83,"_40":41,"_42":108,"_44":45,"_46":109,"_17":48,"_49":50,"_51":110,"_53":54,"_55":-5,"_70":111,"_18":112},{"_33":96,"_13":97,"_36":98,"_38":83,"_40":41,"_42":99,"_44":45,"_46":100,"_17":101,"_49":50,"_51":102,"_53":54,"_55":-5,"_70":103,"_18":104},"8a7077c9-c302-4867-9620-078644758112","root.tsx","01a04b7f-e043-776f-9b1e-554f5bc7b179",213,["D",1788040505046],22,"/** @jsxImportSource npm:hono@4/jsx */\nimport { raw } from \"npm:hono@4/html\";\nimport { immutableFileUrl } from \"https://esm.town/v/std/utils/index.ts\";\n\nexport function Root() {\n return (\n <>\n {raw(\"\")}\n \n \n \n \n \n \n \n \n Polyatomics\n