{"id":"study-periodic-trend-radius-check","audience":"high-school","category":"explaining","technique":"audience","track":"study","title":"Get a periodic trend explained in three steps","free":false,"task":"In Chemistry you memorized that atomic radius shrinks across a period, but you don't get why. Get exactly 3 numbered sentences explaining it with the sodium-to-chlorine example from class, then one line starting 'Check:' with a question to test yourself, under 85 words, plain text. Don't use the terms you haven't learned (effective nuclear charge, Zeff, shielding constant).","materialLabel":"Your chemistry notes (attached to your prompt automatically)","material":"CHEMISTRY (Honors) - Ms. Petrov - Periodic trends - 11/3\n\nATOMIC RADIUS: size of an atom.\n- Down a group: radius gets BIGGER (more energy levels/shells)\n- Across a period (left to right): radius gets SMALLER. <- I memorized this but don't get WHY\n\nMs. Petrov's explanation in class (I half caught it):\n- Going across period 3 from sodium (Na) to chlorine (Cl), every element adds one more proton to the nucleus.\n- The electrons are being added to the SAME energy level (shell 3), so they're not much farther out.\n- More protons = stronger pull on the electrons = electrons pulled in closer.\n- Na has 11 protons, Cl has 17. Both have outer electrons in shell 3.\n\nWords in the textbook we haven't learned yet: effective nuclear charge (Zeff), shielding constant. Ms. P: \"We'll get there in AP Chem. Don't use them yet.\"\n\nMy friend Ana said radius shrinks because \"the atom has fewer electrons,\" but Cl has MORE electrons than Na, so that can't be it.\n\nQuiz Friday on trends. Lab: flame tests Monday.","rules":[{"type":"numberedItems","count":3},{"type":"maxWords","max":85},{"type":"plainText"}],"mistakes":[{"title":"Asking why in general","why":"The AI gives a textbook answer full of terms you haven't learned.","fix":"Point it to your example: \"Use sodium to chlorine from my notes.\"","checks":["r0"]},{"title":"Not saying how many sentences","why":"The AI picks its own number, and it usually picks more sentences than you need.","fix":"Be exact: \"Exactly 3 numbered sentences.\"","checks":["numberedItems"]},{"title":"Not banning new terms","why":"AI reaches for effective nuclear charge, the standard textbook term your teacher said to skip.","fix":"Add: \"Don't use effective nuclear charge, Zeff or shielding constant.\"","checks":["r1"]},{"title":"No way to test yourself","why":"The AI explains and stops, so you never check whether it stuck.","fix":"Add: \"End with one line starting 'Check:' with a question, no answer.\"","checks":["r2"]},{"title":"Trusting the AI to count words","why":"AI is bad at counting. Ask for a total and it often lands 20% over.","fix":"Cap each part: \"each sentence under 18 words.\"","checks":["maxWords"]},{"title":"Forgetting where it will be read","why":"AI formats for a screen, with bold and headings that show up as stray symbols in your notes.","fix":"Say: \"Plain text, no bold, no headings.\"","checks":["plainText"]}],"promptHints":[{"label":"Names the example","patterns":["sodium","chlorine","Na","example"]},{"label":"Says how many sentences","patterns":["\\b(3|three)\\b.{0,25}sentence"]},{"label":"Bans new terms","patterns":["zeff","effective nuclear","shielding","(don't|do not|no).{0,15}terms"]},{"label":"Asks for a check question","patterns":["check:","check question","test (me|myself)","quiz me"]},{"label":"Sets a length limit","patterns":["\\d+\\s*words","word (limit|count)","under \\d+"]}],"hint":"The AI doesn't know what you've learned yet. Point it to your class example, ban the terms you haven't covered, give it a short shape, and ask for a question to test yourself.","rubricLabels":["Explains with the sodium-to-chlorine example: each element adds a proton, the electrons stay in the same shell (shell 3), so the stronger pull draws them in closer","Uses none of the terms effective nuclear charge, Zeff or shielding constant, and does not repeat Ana's 'fewer electrons' idea as correct","Ends with one line starting 'Check:' that asks a question about the trend, and does not answer it"]}