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Because K+ and Cl- are isoelectronic with nearly equal masses, their difference reflections (odd h, k, l) nearly vanish, leaving only reflections corresponding to a simple cubic lattice of spacing a/2 with mean mass (M_KCl)/2 per lattice site. https://w3id.org/delphi/resource/assessment/bragg1913s-04--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-04--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-04--gemini http://www.w3.org/2000/01/rdf-schema#comment Proposed test with existing data: Compare the all-odd (hkl) versus all-even (hkl) X-ray structure factors F(hkl) = 4*(f_K+ +/- f_Cl-) of KCl (space group Fm-3m) using experimental diffraction patterns and atomic scattering factor tables. Confirm if the near-equality of scattering factors for isoelectronic K+ and Cl- (18 electrons each; atomic weights 39.10 and 35.45) suppresses odd-(hkl) reflections, causing the diffraction pattern to mimic a simple cubic lattice of edge a/2 containing half a KCl formula unit per pseudocell. https://w3id.org/delphi/resource/assessment/bragg1913s-04--gemini http://www.w3.org/2000/01/rdf-schema#label Gemini 4 Argon on bragg1913s-04: resolvable-now, resolvability 0.96 https://w3id.org/delphi/resource/assessment/bragg1913s-04--gemini http://www.w3.org/ns/prov#wasAttributedTo https://w3id.org/delphi/resource/agent/delphisci-resolvability-assessor-gemini-4-argon-medium https://w3id.org/delphi/resource/assessment/bragg1913s-04--gemini https://w3id.org/delphi/ontology/assessmentType dataset-resolvability/0.2.0 https://w3id.org/delphi/resource/assessment/bragg1913s-04--gemini https://w3id.org/delphi/ontology/evidenceAgainst Strictly, X-ray scattering amplitude depends on electron count (isoelectronic K+ and Cl- both have 18 electrons) rather than nuclear atomic weight, though in 1913 atomic weight served as the proxy https://w3id.org/delphi/resource/assessment/bragg1913s-04--gemini https://w3id.org/delphi/ontology/hasConfidence 0.95 https://w3id.org/delphi/resource/assessment/bragg1913s-04--gemini https://w3id.org/delphi/ontology/hasEvidence https://w3id.org/delphi/resource/evidence/bragg1913s-04--gemini--dataset-1 https://w3id.org/delphi/resource/assessment/bragg1913s-04--gemini https://w3id.org/delphi/ontology/hasEvidence https://w3id.org/delphi/resource/evidence/bragg1913s-04--gemini--dataset-2 https://w3id.org/delphi/resource/assessment/bragg1913s-04--gemini https://w3id.org/delphi/ontology/hasEvidence https://w3id.org/delphi/resource/evidence/bragg1913s-04--gemini--dataset-3 https://w3id.org/delphi/resource/assessment/bragg1913s-04--gemini https://w3id.org/delphi/ontology/hasScore 0.963 https://w3id.org/delphi/resource/assessment/bragg1913s-04--gemini 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