caption: the structure of nacl rock salt structure
exif: {"Image DocumentName": "Structure of NaCl (Rock salt Structure)", "Image ImageDescription": "Cation (Na+) radius =0.98 \u00c5. Anion (Cl-) =1.81 \u00c5. Radius Ratio= Cl\u2013 ions form fcc . Na+ ions occupy edge centre and body centre. Four NaCl formula units per unit cell. Coordination number Na+:Cl- = 6:6.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}