https://padlet.com/507430/ox4ze34qcshf The Origin of the Atomic Theory en-us 2017-12-07 00:36:18 UTC 2025-10-23 11:45:38 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Growing.png 507430 https://padlet.com/507430/ox4ze34qcshf/wish/213954491 Democritus (460-320 BC) came up with an idea that everything is composed of tiny particles like tiny broken fragments from a rock. ]]> 2017-12-07 00:52:26 UTC https://padlet.com/507430/ox4ze34qcshf/wish/213954491 507430 https://padlet.com/507430/ox4ze34qcshf/wish/213961337 It wasn't known for sure that atoms exists until John Dalton (1766-1844) provided empirical evidence that atoms do exists. ]]> 2017-12-07 01:45:51 UTC https://padlet.com/507430/ox4ze34qcshf/wish/213961337 507430 https://padlet.com/507430/ox4ze34qcshf/wish/213962145 Later, J. J. Thomson (1856-1940) insisted that atoms must consist of smaller particles when he discovered the electron.]]> 2017-12-07 01:53:29 UTC https://padlet.com/507430/ox4ze34qcshf/wish/213962145 507430 https://padlet.com/507430/ox4ze34qcshf/wish/213963742 After the discovery of the electron, Ernest Rutherford (1871-1937) did further research on the Atomic Theory and discovered the nucleus of an atom while taking his gold foil experiment to a new height. ]]> 2017-12-07 02:11:35 UTC https://padlet.com/507430/ox4ze34qcshf/wish/213963742 507430 https://padlet.com/507430/ox4ze34qcshf/wish/213966100 Watch this video for more information about the Atomic Theory. ]]> 2017-12-07 02:31:55 UTC https://padlet.com/507430/ox4ze34qcshf/wish/213966100