https://padlet.com/2036671/ylgfv2fkd8rs Made for the teacher en-us 2016-11-10 18:20:39 UTC 2026-01-18 12:06:46 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Balance.png 203793 https://padlet.com/2036671/ylgfv2fkd8rs/wish/136838029 Democritus was the one who first discovered the atom and called it atomos. He said they were small and all of them were different material. He compared it to a billiard ball small and hard. He claimed that they were infinite, always moving, and capable of joining together.
(notes) (image)]]> 2016-11-10 18:25:23 UTC https://padlet.com/2036671/ylgfv2fkd8rs/wish/136838029 2036671 https://padlet.com/2036671/ylgfv2fkd8rs/wish/136838813 John Dalton was the first person to ever experiment with atoms . He believed atoms looked like billiard balls, that atoms were indestructible, atoms of a same material are the exact same and that atoms from different atoms are different. Compounds were also thought to always contain the same portions of elements. (notes) (picture)]]> 2016-11-10 18:26:58 UTC https://padlet.com/2036671/ylgfv2fkd8rs/wish/136838813 203793 https://padlet.com/2036671/ylgfv2fkd8rs/wish/136839113 Aristotle was a respected and powerful philosopher who disregarded Democritus theory. He said that all matter was made up of earth, water, fire, and air.
(notes) (image) ]]> 2016-11-10 18:27:37 UTC https://padlet.com/2036671/ylgfv2fkd8rs/wish/136839113 203793 https://padlet.com/2036671/ylgfv2fkd8rs/wish/136842729 JJ Thompson discovered the electron. He claimed that it was like Plum pudding because the plums are electrons and the rest are an atom. (notes) (image) ]]> 2016-11-10 18:36:38 UTC https://padlet.com/2036671/ylgfv2fkd8rs/wish/136842729 2036671 https://padlet.com/2036671/ylgfv2fkd8rs/wish/136875048 Rutherford and some students of his were using a gun that shoots alpha particles (Hydrogen Nucleus) at a very thin sheet of gold foil. While they tested this experiment most of the bullets went through the foil and hit a detector. Some bullets were also hit back the direction of the gun. After theorizing he had found the nucleus, the positive part of the atom, and changing the model that Thompson had created. (notes) (picture) ]]> 2016-11-10 19:53:01 UTC https://padlet.com/2036671/ylgfv2fkd8rs/wish/136875048 203793 https://padlet.com/2036671/ylgfv2fkd8rs/wish/137065027 Going off of JJ Thompson's theory Bohr claimed that electrons are placed on specific levels. These levels he called energy levels the orbited the nucleus.
(notes) (image) ]]> 2016-11-11 18:01:21 UTC https://padlet.com/2036671/ylgfv2fkd8rs/wish/137065027 2036671 https://padlet.com/2036671/ylgfv2fkd8rs/wish/137067488 A video about the model created by Rutherford]]> 2016-11-11 18:12:24 UTC https://padlet.com/2036671/ylgfv2fkd8rs/wish/137067488 2036671 https://padlet.com/2036671/ylgfv2fkd8rs/wish/137067822 For a long time scientists were arguing over if electrons were either waves or particles, coming to a compromise that electrons are both waves and particles. The probable location of the electron is based on how much energy an electron has; atoms are also believed to be mostly empty space. Quantum wave mechanics are what made the modern model, which electrons are located in "clouds" or otherwise called "orbitals". When an electrons have lower energy they are closer to the nucleus, when electrons have more energy they are farther away from the nucleus. (notes) (picture)]]> 2016-11-11 18:14:00 UTC https://padlet.com/2036671/ylgfv2fkd8rs/wish/137067822