https://padlet.com/camerondoyle/x54c5xb2rcfcur9v en-us 2022-11-07 14:02:35 UTC 2025-12-15 00:01:13 UTC hello@padlet.com camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373128236 Dismissed Democritus’ atom as “worthless.” Said that the four elements were earth, fire, air and
water. ]]> 2022-11-07 14:05:59 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373128236 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373128797 Mid 300’s B.C.

]]> 2022-11-07 14:06:11 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373128797 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373129244 Aristotle did not believe in the atomic theory. He believed that all things, materials were made from the four elements. The four elements consisted of fire, earth, water, and air. He did not agree with the belief that the universe was made up of atoms.

]]> 2022-11-07 14:06:25 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373129244 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373130391 Was the first person to identify the possibility of an atom

]]> 2022-11-07 14:06:56 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373130391 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373130654 Approx. 400 B.C.

]]> 2022-11-07 14:07:06 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373130654 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373130908 Although Democritus did not discover a atomic model, he formed the belief that “atoms were uniform, solid, hard, incompressible, and indestructible and that they moved in infinite numbers through empty space until stopped.” ]]> 2022-11-07 14:07:13 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373130908 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373131248 Said that an atom has a small positive nucleus and the remainder is empty space. Predicted the
existence of neutrons.]]> 2022-11-07 14:07:23 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373131248 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373131501 1912]]> 2022-11-07 14:07:31 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373131501 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373131860 Rutherford discovered the nuclear atom model. Rutherford illustrated the atom as having a tiny, dense, and positively charged core called the nucleus. Rutherford stated that the mass of the atom is concentrated in its nucleus.]]> 2022-11-07 14:07:41 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373131860 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373132064 Discovered the neutron]]> 2022-11-07 14:07:48 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373132064 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373132287 1939]]> 2022-11-07 14:07:54 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373132287 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373132549 When Chadwick discovered the neutron the cloud model was revised. The revised version of the cloud model is sometimes referred to as the James Chadwick atomic model by scientists.]]> 2022-11-07 14:08:02 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2373132549 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380490712 1803, 1805, 1808]]> 2022-11-11 17:58:41 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380490712 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380490793 Father of modern atomic theory; five parts of his atomic theory including that elements are
composed of atoms and that element’s atoms are identical in mass.]]> 2022-11-11 17:58:47 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380490793 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380491348 John Dalton discovered the Billiard Ball Model. Dalton described  an atom to be a ball-like structure, as the concepts of atomic nucleus and electrons were unknown at the time. John Dalton's atomic theory stated that all matter was comprised of indivisible and indestructible atoms with distinct masses and properties.]]> 2022-11-11 17:59:30 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380491348 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380491422 Discovered the electron.]]> 2022-11-11 17:59:36 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380491422 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380491507 1897]]> 2022-11-11 17:59:43 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380491507 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380491611 J.J. Thomson discovered the Plum Pudding Model. The model proposed that atoms contained small negatively charged electrons.]]> 2022-11-11 17:59:51 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380491611 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380491774 Predicted that electrons travel in specified energy levels.]]> 2022-11-11 17:59:58 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380491774 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380491858 1911, 1915, 1918]]> 2022-11-11 18:00:04 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380491858 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380492030 Bohr discovered the Bohr model. This model proposed that electrons traveled around the nucleus. The Bohr model is a structural model of an atom, and is also known as the Planetary model.]]> 2022-11-11 18:00:15 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380492030 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380492125 Came up with the “uncertainty principle”, which stated that it is impossible to determine the
position and momentum of a particle at the same time.]]> 2022-11-11 18:00:23 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380492125 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380492211 1927]]> 2022-11-11 18:00:31 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380492211 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380492296 Werner Heisenberg discovered the Quantum Mechanical model. This model defined the possibility of putting electrons within an atom by describing the principal energy level, energy level, orbital, and spin. His theory stated that matter has wav-like properties, which his model was based off of.]]> 2022-11-11 18:00:39 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2380492296 camerondoyle https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2382102695 2022-11-14 02:38:13 UTC https://padlet.com/camerondoyle/x54c5xb2rcfcur9v/wish/2382102695