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philosopher who formulated an atomic theory for the universe
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Discovery of the makeup of water, the discovery of combustion and resperation all as a function of oxygen.
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A fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system.
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He is best known for his pioneering work in the development of modern atomic theory, and his research into colour blindness.
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- All matter is made of atoms. Atoms are indivisible and indestructible.
- All atoms of a given element are identical in mass and properties
- Compounds are formed by a combination of two or more different kinds of atoms.
- A chemical reaction is a rearrangement of atoms.
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Was the developer of the periodic table.
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Demonstrated the influence of a magnetic field to the
electron beam. The visible beam appears on the aluminum sheet covered with phosphor, will bent away from the center when a magnet is held near the tube. -
He discovered the electron in 1897. He received the Nobel Prize in Physics in 1906.
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J.J Thomson observed that electrons floating freely in an atom, much like negatively-charged plums surrounded by positively-charged pudding.
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Was an American experimental physicist honored with the Nobel Prize for Physics in 1923 for his measurement of the elementary electronic charge and for his work on the photoelectric effect.
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developed the application of X-ray spectra to study atomic structure; Moseley's discoveries resulted in a more accurate positioning of elements in the Periodic Table by closer determination of atomic numbers.
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The "planetary model" of the atom illustrated in the adjacent figure is used as a symbol for atomic energy . In the Bohr Model the neutrons and protons occupy a dense central region called the nucleus, and the electrons orbit the nucleus much like planets orbiting the Sun.
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came up with a revolutionary theory on atomic structures and radiation emission
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The experiment was believed that the mass of an atom was spread evenly throughout the atom. However the experiment proved that there is instead a small, dense, positively charged nucleus surrounded by mostly empty space and very small, negatively charged electrons
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In Niels Bohr's theory of the atom, the electrons absorb and emit radiation of fixed wavelengths when jumping between the fixed orbits around a nucleus. The theory gave a good description of the spectrum from the hydrogen atom, but must be further developed for more complicated atoms and molecules.
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model is based on mathematics. Although it is more difficult to understand than the Bohr model, it can be used to explain observations made on complex atoms.
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became known as the father of nuclear physics. He is considered the greatest experimentalist since Michael Faraday.
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discovered the neutron
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an atom model wherein electrons are no longer depicted as particles moving around the nucleus in a fixed orbit
