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He thought that all materials on Earth were not made ofatoms, but of the four elements, Earth, Fire, Water, and Air
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Atoms are solid,homegeneous,indestructible, and invisble.
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in the study of chemical reactions
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in the study of chemical reactions
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He first published his Law of Definite Proportions
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All matter is made of atoms. Atoms are indivisible and indestructible. 3) Compounds are formed by a combination of two or more different kinds of atoms.
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best known for his hypothesis that equal volumes of different gases contain an equal number of molecules
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British chemist and physicist noted for his discovery of the element thallium and for his cathode-ray studies, fundamental in the development of atomic physics
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discovered the electron in a series of experiments designed to study the nature of electric discharge in a high-vacuum cathode-ray tube, an area being investigated by numerous scientists at the time.
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is best known as the originator of the quantum theory of energy for which he was awarded the Nobel Prize in 1918.
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Published the famous equation E=mc 2
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Measured the charge of an electron
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naturalized-French physicist and chemist who conducted pioneering research on radioactivity
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But in his classic study of the x-ray spectra of elements, he established the truly scientific basis of the Periodic Table by arranging chemical elements in the order of their atomic numbers.
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he postulated the nuclear structure of the atom
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proposed a theory for the hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities.
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contributed to the atomic theory by including quantum mechanics, the branch of mechanics, based on quantum theory, used for interpretating the behavior of elementary particles and atoms
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He made the first model of the atom
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French physicist best known for his research on quantum theory and for predicting the wave nature of electrons
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discovered the neutron
