caption: a diagram of the periodic trend line
exif: {"Image DocumentName": "Periodic Trend: Electronegativity", "Image ImageDescription": "Periodic Trend: Electronegativity", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}