Atom Timeline by Nysharel Boynes https://padlet.com/boynesnysharela/n1s6z8hlli9f en-us 2018-10-11 18:08:54 UTC 2026-03-01 22:15:06 UTC hello@padlet.com boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291894028 2018-10-11 18:16:22 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291894028 Democritus boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291898075
  • Who: Democritus was an Ancient Greek  pre-Socratic philosopher.
  • What: Democritus was the first to come up with the atomic theory. He had 5 main principles of his atomic theory:  
    1. All material bodies are made up of small particles (atoms).
    2. There is empty space between atoms. 
    3. Atoms can't be destroyed. 
    4. Atoms have always been in motion.
    5. The are an infinite amount of atoms, which differ in shape and size depending on what they are.
  • When: 400 B.C 
  • Where: Greece 
  • Picture:

    • ]]>     2018-10-11 18:23:41 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291898075     Dmitri Mendeleev boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291899139
  • Who: A Russian chemist and inventor who is best known for his formulation of the periodic table.
  • What: He created the Periodic Law and said that elements should be arranged in increasing atomic mass and certain sets of properties that recur periodically.
  • When: 1869
  • Where: Russia
  • Picture: 
    • ]]>     2018-10-11 18:25:33 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291899139     Ernest Rutherford boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291975462
  • Who: A New Zealand-born British physicist who was known as the father of nuclear physics. 
  • What: He discovered the nucleus of an atom by an experiment known as the gold foil experiment. This involved a thin sheet of gold and small particles that were shot at the gold. Rutherford noticed that some particles went through and some were reflected. Eventually, he came to the conclusion that atoms had a nucleus and created the Rutherford model that included it.  
  • When: 1911
  • Where: Britain
  • Picture:

    • ]]>     2018-10-11 22:06:21 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291975462     Erwin Schrodinger boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291975690
  • Who: A Nobel-Peace prize winning Austrian physicist who was known as one of the fathers of quantum mechanics. 
  • What: He came up with a wave equation for the electronic movements of an atom. He found this equation using the Bohr Model as a guide. Schrodinger's equation described the likelihood of finding an electron in a specific position.
  • When: 1926
  • Where: Austria
  • Picture:

    • ]]>     2018-10-11 22:07:42 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291975690     John Dalton boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291976505
  • Who: An English chemist, physicist, and meteorologist who is best known for introducing the atomic theory into chemistry. 
  • What: Even though Democritus came up with the atomic theory first, Dalton added more depth to it. He had 4 main principles which were:
    1. All matter is made up of atoms, which are indivisible and can't be destroyed.
    2. All atoms in an element are identical.
    3. Compounds are made by a combination of two different atoms.
    4. A chemical reaction is the rearrangement of atoms. 
  • When: 1803
  • Where: England
  • Picture:

    • ]]>     2018-10-11 22:13:02 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291976505     Joseph Thomson boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291976645
  • Who: An English physicist who was said to be the discoverer of electrons.
  • What: Thomson discovered electrons by using a cathode ray tube. While doing his experiment, he figured out that they are negatively charged. He used a plum-pudding model to show that an atom is a sphere of positively charged matter with electrons in it to balance out the positive charge. This was later proven to be wrong, once the discovery of the nucleus was made.
  • When: 1897
  • Where: England
  • Picture:

    • ]]>     2018-10-11 22:14:00 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291976645     Niels Bohr boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291976796
  • Who: A Danish physicist who made contributions to the understanding of atomic structure and quantum theory
  • What: He is best known for creating the Bohr Model. It showed that electrons moved around in prescribed orbits around the nucleus and that radiation occurs when electrons jump from one orbit to another. Bohr discovered that the electrons traveled in separate orbits and that the amount of electrons determined the properties of an element.
  • When: 1913
  • Where: England
  • Picture:

    • ]]>     2018-10-11 22:14:55 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291976796     boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291983721 2018-10-11 23:08:15 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291983721 boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291983745 2018-10-11 23:08:26 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291983745 boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291983758 2018-10-11 23:08:34 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291983758 boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291983775 2018-10-11 23:08:43 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291983775 boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291983917 2018-10-11 23:09:45 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291983917 boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291983935 2018-10-11 23:09:54 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291983935 boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291983970 2018-10-11 23:10:08 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291983970 boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291984061 2018-10-11 23:10:49 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291984061 boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291984139 2018-10-11 23:11:31 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291984139 boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291986374 2018-10-11 23:30:43 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/291986374 boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/292001644 2018-10-12 01:23:01 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/292001644 boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/292002091 2018-10-12 01:25:30 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/292002091 boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/292003703 2018-10-12 01:36:27 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/292003703 boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/292006379 2018-10-12 01:56:27 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/292006379 boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/292008243 2018-10-12 02:08:51 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/292008243 boynesnysharela https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/292010868 2018-10-12 02:26:25 UTC https://padlet.com/boynesnysharela/n1s6z8hlli9f/wish/292010868