![]() They believed that it is impossible to know exactly the position and speed of an electron, but only calculate the probability of finding an electron in a specific area. This model is also known as the cloud model or wave mechanics model, proposed by Schrödinger and Heisenberg. He proposed that electrons move on specific orbits at a certain distance from the nucleus, and electrons on different orbits have different energies. Bohr's Atomic Model (1913)ĭanish scientist Niels Bohr modified Rutherford's model. He believed that the center of an atom is a small and dense positive nucleus, and electrons move around the nucleus. New Zealand scientist Ernest Rutherford proposed a new atomic model through a gold foil experiment. He proposed the "plum pudding model", believing that an atom is a sphere with a positive charge, and electrons are dispersed in it like fruit pieces in a pudding. Thomson proved through experiments that there are negatively charged particles inside atoms, which he called electrons. ![]() Thomson's "Plum Pudding Model" (1897)īritish scientist J.J. He also pointed out that the atoms of each element have the same mass, while the atomic masses of different elements are different. Dalton's Atomic Theory (1803)īritish chemist John Dalton proposed that matter is composed of indivisible, indestructible tiny particles-atoms. When talking about the atomic model timeline project, the Scientists' understanding of atoms has gone through several stages, and the following are five main historical models. What are the 5 Major Historical Models of Atomic Theory? The study of atoms and their behavior continues to evolve with new discoveries and advancements in scientific research. This is just a brief overview of the timeline of the atomic theory.
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