1007936
This short biography is accompanied by an image of Dalton and includes the three tenets of Dalton's atomic theory.
Summary
| Subject keyword(s) | Atomic theory, Atoms, Historical perspectives, History and nature of science, Physical science, Scientific breakthroughs, Scientists and inventors, Structure of matter |
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| Grade level | Middle School, High School, Informal Education |
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| Intended audience | Learner |
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| Resource type | Audio/Visual, Reference Material |
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| Resource format | image, image/jpeg, text, text/html |
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| Rights | Eric Weisstein |
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Using this resource
Found in collection(s)
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| Title | Middle School Portal: Math and Science Pathways (MSP2) |
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| Link | http://msteacher2.org/ |
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| Description | The Middle School Portal 2: Math and Science Pathways (MSP2) supports middle grades educators with high-quality, standards-based resources and promotes collaboration and knowledge-sharing among its users. Educators use MSP2 to increase content knowledge in science, mathematics, and appropriate pedagogy for youth ages 10 to 15. MSP2 employs social networking and digital tools to foster dynamic experiences that promote creation, modification, and sharing of resources, facilitate professional development, and support the integration of technology into practice. MSP2 is a project of the Ohio State University College of Education and Human Ecology, National Middle School Association, and Education Development Center, Inc., and is funded by the National Science Foundation. The partners integrate resources, tools, and services across projects, and support multiple methods of resource discovery to meet the needs of this audience. |
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| Full description and distribution of resources |
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Content contained within the resource
Branch of Science Chemists Nationality English Dalton, John (1766-1844) English meteorologist who switched to chemistry when he saw the applications for chemistry of his ideas about theatmosphere. He proposed the Atomic Theory in 1803 which stated that (1) all matter was composed of smallindivisible particles termed atoms, (2) atoms of a given element possess unique characteristics and weight, and (3) threetypes of atoms exist: simple (elements), compound (simple molecules), and complex (complex molecules). Dalton's theorywas presented in New System of Chemical Philosophy (1808-1827). This work identified chemical elements as aspecific type of atom, therefore rejecting Newton's theory of chemical affinities. Instead, Dalton inferred proportions of elements in compounds by taking ratios of the weights of reactants, setting theatomic weight of hydrogen to be identically one. Following Richter, he proposed that chemicalelements combine in integral ratios. Despite the importance of the work as the first view of atoms as physically realentities and introduction of a system of chemical symbols, New System of Chemical Philosophy devoted almost asmuch space to the caloric theory as to atomism. Berzelius, Newton, Richter © 1996-2007 Eric W. Weisstein
