https://padlet.com/l_castellon_2025/flu17m9be0znxx6a en-us 2023-09-12 17:25:23 UTC 2023-09-12 17:30:41 UTC hello@padlet.com l_castellon_2025 https://padlet.com/l_castellon_2025/flu17m9be0znxx6a/wish/2700376678 John Dalton proposed his atomic theory, which laid the foundation for modern atomic theory. He introduced the idea that matter is composed of indivisible atoms, each with its own unique properties.]]> 2023-09-12 17:27:50 UTC https://padlet.com/l_castellon_2025/flu17m9be0znxx6a/wish/2700376678 l_castellon_2025 https://padlet.com/l_castellon_2025/flu17m9be0znxx6a/wish/2700377222 J.J. Thomson's experiments with cathode rays led to the discovery of the electron, a subatomic particle with a negative charge. This discovery challenged Dalton's idea of indivisible atoms.]]> 2023-09-12 17:28:12 UTC https://padlet.com/l_castellon_2025/flu17m9be0znxx6a/wish/2700377222 l_castellon_2025 https://padlet.com/l_castellon_2025/flu17m9be0znxx6a/wish/2700378339 Ernest Rutherford proposed the nuclear model of the atom. He conducted the famous gold foil experiment, which revealed that atoms have a small, dense, positively charged nucleus at their center, surrounded by negatively charged electrons.]]> 2023-09-12 17:28:56 UTC https://padlet.com/l_castellon_2025/flu17m9be0znxx6a/wish/2700378339 l_castellon_2025 https://padlet.com/l_castellon_2025/flu17m9be0znxx6a/wish/2700378790 Niels Bohr developed a quantum model of the atom, introducing the concept of electron energy levels or orbits. Electrons were allowed to exist only in specific energy levels, and they emit or absorb energy in discrete amounts when transitioning between levels.]]> 2023-09-12 17:29:14 UTC https://padlet.com/l_castellon_2025/flu17m9be0znxx6a/wish/2700378790 l_castellon_2025 https://padlet.com/l_castellon_2025/flu17m9be0znxx6a/wish/2700379271 James Chadwick discovered the neutron, a subatomic particle with no electrical charge. The discovery of the neutron completed the picture of the atomic nucleus, which consists of protons (positively charged) and neutrons (uncharged) at the center.]]> 2023-09-12 17:29:35 UTC https://padlet.com/l_castellon_2025/flu17m9be0znxx6a/wish/2700379271 l_castellon_2025 https://padlet.com/l_castellon_2025/flu17m9be0znxx6a/wish/2700380426 The modern atomic model builds upon the contributions of Dalton, Thomson, Rutherford, Bohr, and Chadwick, as well as later developments in quantum mechanics and particle physics.
In the modern model, atoms are described as consisting of a nucleus containing protons and neutrons, with electrons occupying specific energy levels or electron orbitals around the nucleus.
Quantum mechanics, wave-particle duality, and the Schrödinger equation are key components of the modern atomic model, providing a detailed and accurate description of atomic behavior.
The modern model also incorporates the concept of atomic orbitals, which describe the probability of finding electrons in specific regions around the nucleus.]]> 2023-09-12 17:30:21 UTC https://padlet.com/l_castellon_2025/flu17m9be0znxx6a/wish/2700380426