https://padlet.com/heholmquist/8p30udek6l368kq0 Made by Henry Holmquist en-us 2020-12-04 14:49:53 UTC 2026-02-03 14:18:22 UTC hello@padlet.com heholmquist https://padlet.com/heholmquist/8p30udek6l368kq0/wish/987729507 In the year 400 B.C. Democritus stated that atoms are indivisible. He named the atoms, "Atomos" and it means indestructible. He said atoms come together to make different elements. The analogy for this theory were Legos.]]> 2020-12-04 14:53:25 UTC https://padlet.com/heholmquist/8p30udek6l368kq0/wish/987729507 heholmquist https://padlet.com/heholmquist/8p30udek6l368kq0/wish/992747896 Aristotle's theory of the atom went from the year 300 B.C to the 1800s. His contribution was that he thought that the atoms were made out of all four elements. Water, earth, fire and air. He said the only four properties for the atoms was warm, cool, moist or dry. The analogy for this theory was the death to the field of chemistry]]> 2020-12-07 03:56:41 UTC https://padlet.com/heholmquist/8p30udek6l368kq0/wish/992747896 heholmquist https://padlet.com/heholmquist/8p30udek6l368kq0/wish/992757233 In the year 1803 Dalton's atomic theory was that the atom was too small to see, uncuttable and indestructible. The analogy for this was a billiard ball because his model was shaped like one.]]> 2020-12-07 04:03:00 UTC https://padlet.com/heholmquist/8p30udek6l368kq0/wish/992757233 heholmquist https://padlet.com/heholmquist/8p30udek6l368kq0/wish/992771272 In the year 1897 Thomson said there are small, negatively charged particles inside an atom called electrons and then that led to the "Plum Pudding Model" which shows negative particles are mixed into a positively charged substance.]]> 2020-12-07 04:12:07 UTC https://padlet.com/heholmquist/8p30udek6l368kq0/wish/992771272 heholmquist https://padlet.com/heholmquist/8p30udek6l368kq0/wish/992790086 In the year 1908 Rutherford made the discovery that the nucleus is dense and positively charged. He said atoms are mostly filled with empty space and electrons are scattered around the nucleus at a distance. ]]> 2020-12-07 04:24:09 UTC https://padlet.com/heholmquist/8p30udek6l368kq0/wish/992790086 heholmquist https://padlet.com/heholmquist/8p30udek6l368kq0/wish/992796894 In the year 1913 Bohr said that the atom had the most weight in the nucleus. He added the idea of quantum jumps which is when electrons jump between different energy levels. Instead of having random orbits, electrons occupied very specific energy levels. He described it as a multi story building. The nucleus at the bottom floor with the least amount of energy, and the the electrons taking up the stories above. 

]]> 2020-12-07 04:28:26 UTC https://padlet.com/heholmquist/8p30udek6l368kq0/wish/992796894 heholmquist https://padlet.com/heholmquist/8p30udek6l368kq0/wish/992804822 James Chadwick discovered neutrons in the 20th century. He helped prove the idea of the most of the weight being in the nucleus by describing what was in the nucleus.]]> 2020-12-07 04:33:25 UTC https://padlet.com/heholmquist/8p30udek6l368kq0/wish/992804822 heholmquist https://padlet.com/heholmquist/8p30udek6l368kq0/wish/992808439 Schrodinger's Cloud model shows the electrons moving between different energy level and shows we have no way of knowing where specifically an electron is at a certain time but in a general area instead. ]]> 2020-12-07 04:35:29 UTC https://padlet.com/heholmquist/8p30udek6l368kq0/wish/992808439