https://padlet.com/184570/lme17w24qdoc By Stephanie Park and Kristina Sievers en-us 2018-02-06 14:38:05 UTC 2023-05-31 19:00:47 UTC hello@padlet.com 184570 https://padlet.com/184570/lme17w24qdoc/wish/228618383 2018-02-06 14:40:46 UTC https://padlet.com/184570/lme17w24qdoc/wish/228618383 184570 https://padlet.com/184570/lme17w24qdoc/wish/228618473 2018-02-06 14:40:53 UTC https://padlet.com/184570/lme17w24qdoc/wish/228618473 184570 https://padlet.com/184570/lme17w24qdoc/wish/228618521 2018-02-06 14:40:57 UTC https://padlet.com/184570/lme17w24qdoc/wish/228618521 184570 https://padlet.com/184570/lme17w24qdoc/wish/228618688 2018-02-06 14:41:15 UTC https://padlet.com/184570/lme17w24qdoc/wish/228618688 184570 https://padlet.com/184570/lme17w24qdoc/wish/228618742 2018-02-06 14:41:21 UTC https://padlet.com/184570/lme17w24qdoc/wish/228618742 184570 https://padlet.com/184570/lme17w24qdoc/wish/228622573 2018-02-06 14:47:05 UTC https://padlet.com/184570/lme17w24qdoc/wish/228622573 184570 https://padlet.com/184570/lme17w24qdoc/wish/228622610 2018-02-06 14:47:08 UTC https://padlet.com/184570/lme17w24qdoc/wish/228622610 184570 https://padlet.com/184570/lme17w24qdoc/wish/228624567 2018-02-06 14:49:48 UTC https://padlet.com/184570/lme17w24qdoc/wish/228624567 184570 https://padlet.com/184570/lme17w24qdoc/wish/228624869 2018-02-06 14:50:15 UTC https://padlet.com/184570/lme17w24qdoc/wish/228624869 370138 https://padlet.com/184570/lme17w24qdoc/wish/228625860 Dalton was the first scientist to put down the basic ideas for the modern atom. The main points are: 
- Elements are made of extremely small particles called atoms.
- Atoms of a given element are identical in size, mass and other properties; atoms of different elements differ in size, mass and other properties.
- Atoms cannot be subdivided, created or destroyed.
- Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
- In chemical reactions, atoms are combined, separated or rearranged.]]> 2018-02-06 14:51:14 UTC https://padlet.com/184570/lme17w24qdoc/wish/228625860 184570 https://padlet.com/184570/lme17w24qdoc/wish/228627326 2018-02-06 14:53:10 UTC https://padlet.com/184570/lme17w24qdoc/wish/228627326 370138 https://padlet.com/184570/lme17w24qdoc/wish/228627606 2018-02-06 14:53:32 UTC https://padlet.com/184570/lme17w24qdoc/wish/228627606 184570 https://padlet.com/184570/lme17w24qdoc/wish/228628849 Bohr believed Rutherford's prediction was correct, but it wasn't complete. He proposed electrons could only move between energy levels, rather then being able to move everywhere. 
As the radius of the orbit decreases, the orbit becomes closer to the nucleus and the energy lowers.

]]> 2018-02-06 14:55:01 UTC https://padlet.com/184570/lme17w24qdoc/wish/228628849 184570 https://padlet.com/184570/lme17w24qdoc/wish/228631529 2018-02-06 14:58:29 UTC https://padlet.com/184570/lme17w24qdoc/wish/228631529 370138 https://padlet.com/184570/lme17w24qdoc/wish/228638817 2018-02-06 15:09:07 UTC https://padlet.com/184570/lme17w24qdoc/wish/228638817 184570 https://padlet.com/184570/lme17w24qdoc/wish/228639872 2018-02-06 15:10:32 UTC https://padlet.com/184570/lme17w24qdoc/wish/228639872 184570 https://padlet.com/184570/lme17w24qdoc/wish/228641405 He discovered that the nucleus contains neutrons and theorized that neutrons have no electrical charge. Neutrons have a mass equal to the mass of a proton. He also determined that the unit of measurement for subatomic particles is the atomic mass unit (amu).]]> 2018-02-06 15:12:30 UTC https://padlet.com/184570/lme17w24qdoc/wish/228641405 184570 https://padlet.com/184570/lme17w24qdoc/wish/228644719 2018-02-06 15:17:18 UTC https://padlet.com/184570/lme17w24qdoc/wish/228644719 184570 https://padlet.com/184570/lme17w24qdoc/wish/228649368 Curie discovered the radioactive elements radium and polonium. By finding that radioactive atoms decompose into smaller particles, it also explained that atoms are made up of small particles.]]> 2018-02-06 15:23:58 UTC https://padlet.com/184570/lme17w24qdoc/wish/228649368 370138 https://padlet.com/184570/lme17w24qdoc/wish/228661552 Democritus stated that, “the universe is composed of two elements: the atoms and the void in which they exist and move.” According to him atoms were minuscule quantities of matter. ]]> 2018-02-06 15:40:40 UTC https://padlet.com/184570/lme17w24qdoc/wish/228661552 184570 https://padlet.com/184570/lme17w24qdoc/wish/228662091 2018-02-06 15:41:27 UTC https://padlet.com/184570/lme17w24qdoc/wish/228662091 370138 https://padlet.com/184570/lme17w24qdoc/wish/228664048 2018-02-06 15:44:16 UTC https://padlet.com/184570/lme17w24qdoc/wish/228664048 184570 https://padlet.com/184570/lme17w24qdoc/wish/228664254 After using a cathode ray tube for his experiment, he proposed that atoms consist of negatively  charged particles called electrons. The electrons were embedded in a positively-charged sphere. His model for the electrons famously became known as the "Plum Pudding Model".]]> 2018-02-06 15:44:34 UTC https://padlet.com/184570/lme17w24qdoc/wish/228664254 370138 https://padlet.com/184570/lme17w24qdoc/wish/228664826 By using his gold foil experiment, he demonstrated that the atom has a tiny and heavy nucleus. He designed this experiment to use the alpha particles emitted by a radioactive element as probes to the unseen world of atomic structure.]]> 2018-02-06 15:45:26 UTC https://padlet.com/184570/lme17w24qdoc/wish/228664826 370138 https://padlet.com/184570/lme17w24qdoc/wish/228668316 2018-02-06 15:50:35 UTC https://padlet.com/184570/lme17w24qdoc/wish/228668316 184570 https://padlet.com/184570/lme17w24qdoc/wish/228668700 2018-02-06 15:51:02 UTC https://padlet.com/184570/lme17w24qdoc/wish/228668700 184570 https://padlet.com/184570/lme17w24qdoc/wish/228672906 2018-02-06 15:56:13 UTC https://padlet.com/184570/lme17w24qdoc/wish/228672906 370138 https://padlet.com/184570/lme17w24qdoc/wish/228790965 2018-02-06 18:52:31 UTC https://padlet.com/184570/lme17w24qdoc/wish/228790965