The existence of atoms wasn't scientifically proven until the early 1800s.
{"Image DocumentName": "The existence of atoms wasn\u2019t scientifically proven until the early 1800s.", "Image ImageDescription": "John Dalton, , English chemist and teacher. Studied the behavior of gases in air. Concluded that gas contains individual particles. No matter how large or small the sample the ratio of the elements in compounds is always the same.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}