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Democritus
Democritus was the inventor of the atomic theory, which stated:
1.All matter consists of invisible particles called atoms.
2. Atoms are indestructible.
3. Atoms are solid but invisible.
4. Atoms are homogenous.- Atoms differ in size, shape, mass, position, and arrangement.
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John Dalton
Dalton also came up with an atomic theory, in which atoms are pure elements, and elements differenciate due to their different masses. He also came up with the idea that atoms rearrange and combine during chemical reactions. Creator of the solid sphere model. -
Henry Becquerel
Becquerel had many discoveries on rays in atoms, such as "since gamma rays carry no electric charge, they can go large distances through thick materials". -
J.J. Thompson
Thompson was the discoverer of the charges of protons and electrons, and also created the Plum Pudding Model. This model was made to display positive and negative charges balancing out within an atom. -
Mac Planck
Planck is the creator of the Planck Quantum Theory. This states that light is a photon and is a wave. His work contributed significantly to the understanding of atomic and subatomic processes. -
Ernest Rutherford
Rutherford was one of the first men to expieriment with magnetic properties of the iron atom. He also established the disintagration theory, in which atoms will break down over time, not molecules. He came up with the idea that electrons orbit the nucleus as planets orbit the sun. -
Erwin Schrödinger
Erwin Schrödinger was the inventor of the Cloud Model. This is where the estimated electrons are found within a certain area. -
Neils Bohr
Bohr came up with the idea that an atom has protons and neutrons in a center called the nucleus, and also created the Bohr model depicting the amount of shells in an atom, and stating in the Bohr Model, the neutrons and protons occupy a central region called the nucleus,surrounded my electrons. -
Chadwick
Chadwick contrasted the Bohr model by mathematically finding out the probability of where every electron can be. This is called the quantum mechanical model. Contrary to the Bohr Model, this finds out the likelihood of where the electron will be, not its exact path. -
Marie Sklodowska Curie
Curie discovered radium and polonium, and came up with the idea of radioactivity after studying it. -
Sir Issac Neuton
Neuton discovered that there are tiny particles that are constantly moving. -
Aristotle
Aristotle did not believe in the atomic theory, and thought that the world was made of four elements. These elements are fire, water, Earth, and air. Most people followed Aristotle's teachings, making Democritus' teachings invalid untill Aristotle's were proven wrong several years later.
