| Source | Precisely what was checked; reuse boundary |
|---|---|
| QCAA Chemistry General landing and 2025 v1.3 official PDF | Current version for 2026+ completions, Unit 1 title/objectives, Topic 1 Properties and structure of atoms 20h, printed pp.19–22 first atomic/isotope/periodic/SHE bullets, 55h unit and Units 1–2 school assessment on pp.5–6. Official PDF text was read live. We link and point to locations, not reproduce QCAA diagrams/pages or claim endorsement. Recheck before adoption. |
| IUPAC Gold Book: atomic number, mass number, isotopes, ion | Independent terminology check: Z is proton number, A counts nuclear protons and neutrons, isotopes have same Z with different A, and ions carry charge. We wrote new explanations and exercises; no Gold Book definition passages copied. Individual Gold Book terms have their own CC BY-SA terms and collection restrictions; SubjectNest's CC BY notice does not relicense IUPAC content. |
| CIAAW Standard Atomic Weights 2024 and Isotopic Compositions 2024 | Checked symbol/Z pairs and example isotope mass numbers: B-10/11, C-12/13, O-16, F-19, Na-23, Mg-24/26, Cl-35/37 and Ca-40. Also confirmed decimal atomic weight differs from one isotope's integer mass number. We do not use any real abundance values as invented case data or reproduce CIAAW tables. |
| NIST magnesium isotope composition | Independent spot-check for Mg Z12 and Mg-24/Mg-26 existence. Our paper card's charged state is given for bookkeeping; this table is not evidence of a sample, reaction or free-ion stability. |
Calculation method: For each specified paper nuclide, p=Z and n=A−Z. Neutral e=Z. Given monoatomic charge q (integer elementary-charge units), e=Z−q, so p−e=q; p+n=A checks the nuclear count. A Python arithmetic audit in verify_pack.py recomputes every check-key triple and selected practice triples rather than trusting typeset answers. Values and context names are original presentation choices; none is an actual assay, safety evaluation, medical claim or radiation exercise.
Originality and licence: All case files, scripts, tasks, answers and printable diagrams are newly authored SubjectNest content © NeuroForgeIO Pty Ltd 2026, CC BY 4.0. Credit SubjectNest, link the licence, indicate changes. QCAA, IUPAC, CIAAW and NIST retain their own rights; only sourced scientific facts and links, not their tables, images, questions or substantial wording, were used. The generated SVGs request DejaVu Sans; the installed font's complete notice is included in font rights and font licence file. No external illustration, audio, cultural story, translated worksheet, proprietary simulation, real sample data or copied exam question is included.
Claim boundaries: Files are fictional paper species and display labels. A label does not certify a real product's chemistry, health effects, purity, environmental impact or provenance. No classroom pilot, translation check, specialist access review, cultural review, lab result or measured learning impact has occurred.