caption: Elements in the same row or period, have same number of energy levels.
exif: {"Image DocumentName": "Elements in the same row or period, have same number of energy levels.", "Image ImageDescription": "11Na 13 Al 15P.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}