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Atomic Theory

1. Atomic Theory The History and Development of the Atomic Theory The atom is considered the smallest particle of matter. Many scientist tried to study and investigate its existence. From 18 th century until today our view of the atom has changed because of new ideas and advancements in technology. The atomic model is a representation of what an atom could look based on observations and scientific evidence that how atoms behave. THE STRUCTURE MATTERS: THE DEVELOPMENT OF ATOMIC STRUCTURE Figure 11.1

2. All things are composed of atomos , which may be too small to be seen by the naked or unaided eye and cannot be broken down to smaller parts. There are empty spaces between these inner structures of matter. Matter is made up of solid particles. Matter has a uniform structure all throughout. Matter varies in shape, size, and weight. Proposed the following ideas about atoms Figure 11.2

3. Aristotle and his idea that matter was made up of four natural elements Aristotle believe that matter was made up of four natural elements where the ratio of these four elements affects the property of matter and can also be transformed into one another . Because Aristotle was more famous and influential than Democritus, the ideas of the latter never took hold. It took more 2000 years before the concept of atom reemerged. Figure 11.3 Aristotle and his idea that matter was made up of four natural elements

4. Have you ever experienced that your idea was not accepted because of someone who is more famous or influential than you has another idea even though yours might be better?