![]() While the historical persons and dates behind these experiments can be quite interesting, it is most important to understand the concepts resulting from their work. Here, we will discuss some of those key developments, with an emphasis on application of the scientific method, as well as understanding how the experimental evidence was analyzed. Much of this came from the results of several seminal experiments that revealed the details of the internal structure of atoms. ![]() Object ID EM.N-08013-B overall length 40 cm, glass ball diam. In the two centuries since Dalton developed his ideas, scientists have made significant progress in furthering our understanding of atomic theory. Thomsons cathode ray tube 3, replica of Cavendish Lab apparatus. And if atoms are neither created nor destroyed during a chemical change, then the total mass of matter present when matter changes from one type to another will remain constant (the law of conservation of matter). For example, if an element such as copper consists of only one kind of atom, then it cannot be broken down into simpler substances, that is, into substances composed of fewer types of atoms. Mass of one mole of electron : It is 0 mg. Mass of electron at speed v is m Atomic mass unit : It is 0 amu. (credit copper: modification of work by ).ĭalton’s atomic theory provides a microscopic explanation of the many macroscopic properties of matter that you’ve learned about. Specific charge : e/m ratio is called specific charge and was determined by Thomson as 1 × 10 8 coulombs/gm. \): When the elements copper (a shiny, red-brown solid, shown here as brown spheres) and oxygen (a clear and colorless gas, shown here as red spheres) react, their atoms rearrange to form a compound containing copper and oxygen (a powdery, black solid).
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