https://padlet.com/michaelm1305/62hp05kj4zxvozpi en-us 2023-10-03 12:32:28 UTC 2023-10-03 12:48:19 UTC hello@padlet.com michaelm1305 https://padlet.com/michaelm1305/62hp05kj4zxvozpi/wish/2730163207 Democritus’s model stated that matter consists of invisible particles called atoms and an empty space. He said that atoms are indestructible and unchangeable. and that they were homogenous, meaning they have no internal structure.]]> 2023-10-03 12:38:59 UTC https://padlet.com/michaelm1305/62hp05kj4zxvozpi/wish/2730163207 michaelm1305 https://padlet.com/michaelm1305/62hp05kj4zxvozpi/wish/2730166621 It is often referred to as the billiard ball model. He defined an atom to be a ball-like structure, as the concepts of atomic nucleus and electrons were unknown at the time. If you asked Dalton to draw the diagram of an atom, he would've simply drawn a circle!]]> 2023-10-03 12:41:11 UTC https://padlet.com/michaelm1305/62hp05kj4zxvozpi/wish/2730166621 michaelm1305 https://padlet.com/michaelm1305/62hp05kj4zxvozpi/wish/2730171360 The first part of his theory states that all matter is made of atoms, which are indivisible. The second part of the theory says all atoms of a given element are identical in mass and properties. The third part says compounds are combinations of two or more different types of atoms.]]> 2023-10-03 12:43:54 UTC https://padlet.com/michaelm1305/62hp05kj4zxvozpi/wish/2730171360 michaelm1305 https://padlet.com/michaelm1305/62hp05kj4zxvozpi/wish/2730173623 Summary. J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup."]]> 2023-10-03 12:45:16 UTC https://padlet.com/michaelm1305/62hp05kj4zxvozpi/wish/2730173623 michaelm1305 https://padlet.com/michaelm1305/62hp05kj4zxvozpi/wish/2730176173 In 1911, Rutherford described the atom as having a tiny, dense, and positively charged core called the nucleus. Rutherford established that the mass of the atom is concentrated in its nucleus. The light, negatively charged, electrons circulated around this nucleus, much like planets revolving around the Sun.]]> 2023-10-03 12:46:39 UTC https://padlet.com/michaelm1305/62hp05kj4zxvozpi/wish/2730176173 michaelm1305 https://padlet.com/michaelm1305/62hp05kj4zxvozpi/wish/2730177548 In 1913, Niels Bohr proposed a theory for the hydrogen atom, based on quantum theory that some physical quantities only take discrete values. Electrons move around a nucleus, but only in prescribed orbits, and If electrons jump to a lower-energy orbit, the difference is sent out as radiation.]]> 2023-10-03 12:47:36 UTC https://padlet.com/michaelm1305/62hp05kj4zxvozpi/wish/2730177548 michaelm1305 https://padlet.com/michaelm1305/62hp05kj4zxvozpi/wish/2730178684 The Quantum Mechanical Atomic Model was developed by Austrian physicist Erwin Schrödinger in 1926, using the wave-particle duality of the electron to solve a complex mathematical equation that accurately described the behavior of the electron in a hydrogen atom.]]> 2023-10-03 12:48:19 UTC https://padlet.com/michaelm1305/62hp05kj4zxvozpi/wish/2730178684