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Comparing full structure factors against heavy-atom-only structure factors immediately confirms that heavy atoms dominate the primary lattice reflections in KBr, KI, ZnS, and CaF2, while showing that the literal 'heavy atoms alone' clause is only a first-order approximation because light atoms produce measurable superstructure/difference intensities. https://w3id.org/delphi/resource/assessment/bragg1913s-02--gemini http://purl.org/dc/terms/subject https://w3id.org/delphi/resource/concept/dataset-resolvability-0.2.0 https://w3id.org/delphi/resource/assessment/bragg1913s-02--gemini http://www.w3.org/1999/02/22-rdf-syntax-ns#type https://w3id.org/delphi/ontology/LLMClaimAssessment https://w3id.org/delphi/resource/assessment/bragg1913s-02--gemini http://www.w3.org/2000/01/rdf-schema#comment Proposed test with existing data: For the 1913 crystal set (ZnS, CaF2, CaCO3, NaCl, KCl, KBr, KI), compute structure factors F(hkl) from full atomic coordinates and compare observed diffraction reflection intensities against the sublattice of heavy atoms alone when Z_heavy / Z_light >= 2. 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