https://padlet.com/118790/uug40a9bx88u en-us 2016-11-08 21:57:46 UTC 2025-10-29 19:40:17 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Thunder.png 118790 https://padlet.com/118790/uug40a9bx88u/wish/136256948 Democritus' atomic theory was that all matter is particles called atoms. In his opinion , atoms are indestructible, invisible, and differ in size. ]]> 2016-11-08 22:17:12 UTC https://padlet.com/118790/uug40a9bx88u/wish/136256948