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This Concept Map, created with IHMC CmapTools, has information related to: The Atom - Concept Map.cmap Alejandro_Arosemena, Neutrons They are referred as Subatomic particles, The Atomic Theory of Matter which consists on several basic laws, 40 to 270 pm However, nuclei has a radii of only about 0.001 pm, John Dalton who turned Democritus's idea into a scientific theory, atoms which come from the Greek word "atomos", meaning "indivisible"., atoms they consist of two regions The Electron Cloud, 400 BCE by Greek thinkers such as Democritus, In 1897, by J. J. Thomson, with a cathode-ray tube. this led to the development of The Plum Pudding Model, picometers pm (10^-12 m) Atomic radii range from about 40 to 270 pm, Chemists accepted the definition of element as a substance that cannot be further broken down by ordinary chemical means. and also began ascribing rules to how matter interacts, was later succeded by Aristotle who instead thought all matter was continuous, and divided into 4 elements, Scientists began gathering evidence that supported Democritus's theory which became known as The Atomic Theory of Matter, 1. All matter is composed of small particles called atoms, identical in their properties. 2. Atoms cannot be subdivided, created or destroyed, and they combine in whole-number ratios to form compounds. 3. During chemical reactions, atoms are combined, separated, or rearranged. however Not all aspects from this theory were correct., It was proved false with new experiments. afterwards Ernest Rutherford discovered the small, positively charged nucleus in an experiment involving alpha particles., The Atomic Theory of Matter It originated by The late 18th century, For nearly 2000 years, no one believed in The Particle Theory of Matter, Niels Bohr proposed a model in which electrons surrounded the nucleus, known as "Bohr model" After these discoveries, it is accepted that The nucleus has short-range proton-proton, proton-neutron, and neutron-neutron forces, which hold the nuclear particles together and are referred to as nuclear forces., Democritus who was later succeded by Aristotle, began ascribing rules to how matter interacts this led to the discovery of The Atomic Theory of Matter, was later succeded by Aristotle who did not believe in atoms