Atom Project by Anna Williams https://padlet.com/2037171/yumau8224t33 en-us 2016-11-10 18:15:03 UTC 2025-10-13 20:29:23 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Apple.png Ernest Rutherford 2037171 https://padlet.com/2037171/yumau8224t33/wish/136837874 In 1908, Ernest Rutherford performed the Gold Foil Experiment where he built a gun that shot alpha particles at gold foil, and observed the reactions. He essentially discovered the nucleus when the alpha particles occasionally bounced back off the foil. He concluded that the small positively charged core of atoms was a nucleus. He came up with the nuclear model of the atom.(Notes)
Video: ]]> 2016-11-10 18:25:04 UTC https://padlet.com/2037171/yumau8224t33/wish/136837874 Democritus vs  Aristotle 214159 https://padlet.com/2037171/yumau8224t33/wish/136839111 Democritus
Believed that all atoms were small, hard particles that were all made of the same material but were different shape and size.
Aristotle 
He believed that everything is made of air, fire, earth, and water. 
(Notes)
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]]> 2016-11-10 18:27:37 UTC https://padlet.com/2037171/yumau8224t33/wish/136839111 Bohr Model 2037171 https://padlet.com/2037171/yumau8224t33/wish/136870844 In 1913, Neils Bohr stated that electrons move from energy levels and orbit around the nucleus.
(Notes)
Picture: ]]> 2016-11-10 19:41:41 UTC https://padlet.com/2037171/yumau8224t33/wish/136870844 Wave Model 2037171 https://padlet.com/2037171/yumau8224t33/wish/137053978 Today's model is based on the Quantum Model/Wave Model of the atom. The model is based on wave mechanics techniques. This states that an atom is mostly empty space, contains a very small nucleus, and electrons move in an electron cloud. (Notes)
Picture:]]> 2016-11-11 17:10:15 UTC https://padlet.com/2037171/yumau8224t33/wish/137053978 Albert Einstein 2037171 https://padlet.com/2037171/yumau8224t33/wish/137069753 In 1905, Albert Einstein concluded that different particles make up light. Also, he created the theory of relativity.
(Timeline)
Picture:]]> 2016-11-11 18:22:48 UTC https://padlet.com/2037171/yumau8224t33/wish/137069753 Dalton's 214159 https://padlet.com/2037171/yumau8224t33/wish/137070063 Believed that all matters of an elements are identical, but different elements has different sizes and composed of atoms that are inadvisable.
(Notes)
PicSource]]> 2016-11-11 18:24:17 UTC https://padlet.com/2037171/yumau8224t33/wish/137070063 Robert Millikan 2037171 https://padlet.com/2037171/yumau8224t33/wish/137088338 In 1908, Robert Millikan discovered the electric charge of the electron. (Timeline) He reached this conclusion when he performed the oil-drop experiment. (Quizlet)
Picture:]]> 2016-11-11 19:47:17 UTC https://padlet.com/2037171/yumau8224t33/wish/137088338 JJ Thomson’s plum pudding 214159 https://padlet.com/2037171/yumau8224t33/wish/137250098 The first one to discover the electrons in 1897. He referred to his theory as the Plum Pudding where he said that the Plums were the negatively charged parts that get attracted to the positively charged parts or what he referred to as Pudding. In case of the same parts getting together, they repulse.
(Notes) 
PicSource]]> 2016-11-14 01:42:14 UTC https://padlet.com/2037171/yumau8224t33/wish/137250098 James Chadwick 214159 https://padlet.com/2037171/yumau8224t33/wish/137251890 In 1932, James Chadwick pealed beryllium atoms with alpha particles, which produced an unknown radiation that became known as neutrons. Chadwick referred to this radiation as being embodied of particles with a neutral electrical charge and the approximate mass of a proton.
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