https://padlet.com/3234331/itzriy6iwz1e a timeline of major atomic theories en-us 2018-02-05 16:37:45 UTC 2024-12-12 11:47:49 UTC hello@padlet.com 3234331 https://padlet.com/3234331/itzriy6iwz1e/wish/228209297 Lived Around 450 BC

Democritus theorized that all thing are made up of atoms.]]> 2018-02-05 16:40:07 UTC https://padlet.com/3234331/itzriy6iwz1e/wish/228209297 208587 https://padlet.com/3234331/itzriy6iwz1e/wish/228211116 In 1898
Marie Curie announced the discoveries of two new elements radium and polonium. She also discovered that radioactivity depended on the amount of element present in the compound. ]]> 2018-02-05 16:43:10 UTC https://padlet.com/3234331/itzriy6iwz1e/wish/228211116 322034 https://padlet.com/3234331/itzriy6iwz1e/wish/228211137 Created the Rutherford atomic model (a description of atoms) in 1911. The model described the atom's nucleus, and that the atom is mostly comprised of empty space. ]]> 2018-02-05 16:43:11 UTC https://padlet.com/3234331/itzriy6iwz1e/wish/228211137 208587 https://padlet.com/3234331/itzriy6iwz1e/wish/228212699 Around the year 1803

Dalton added on to Democritus's theory by saying that atoms are indestructible and indivisible, all atoms of the same element are identical, and  that compounds are formed by a combination of two or more different kinds of atoms.]]> 2018-02-05 16:45:30 UTC https://padlet.com/3234331/itzriy6iwz1e/wish/228212699 322034 https://padlet.com/3234331/itzriy6iwz1e/wish/228214503 In 1897, Thomson came to the conclusion that all matter contains masses contains particles of the same kind but are smaller than atom in which they form a part. This is known as the electrons. ]]> 2018-02-05 16:48:23 UTC https://padlet.com/3234331/itzriy6iwz1e/wish/228214503 3234331 https://padlet.com/3234331/itzriy6iwz1e/wish/228214685 2018-02-05 16:48:40 UTC https://padlet.com/3234331/itzriy6iwz1e/wish/228214685 3234331 https://padlet.com/3234331/itzriy6iwz1e/wish/228214905 2018-02-05 16:48:57 UTC https://padlet.com/3234331/itzriy6iwz1e/wish/228214905 3234331 https://padlet.com/3234331/itzriy6iwz1e/wish/228216463 Theorized in the 1930s that atoms are not only made up of protons, but also neutrons.]]> 2018-02-05 16:51:06 UTC https://padlet.com/3234331/itzriy6iwz1e/wish/228216463 3234331 https://padlet.com/3234331/itzriy6iwz1e/wish/228219264 In 1913,
Bohr theorized that electrons move around the proton in specific orbits. Also, he thought that whenever an electron moved to a lower energy level, light was emitted.]]> 2018-02-05 16:54:48 UTC https://padlet.com/3234331/itzriy6iwz1e/wish/228219264