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Chemistry (181)
CHM 113 (103)
Ron Briggs (24)

Atomic Theory & Isotopes

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CHM 113
Ron Briggs

Dalton’s Atomic Theory (1803-1807) - Elements are composed of various small particles called atoms - All atoms of the same element are identical to one another - Atoms of one element cannot be changed into atoms of a different element - Compounds are formed when atoms of more than one element combine with one another - Compounds always have the same relative number and kinds of atoms (Law of Constant Composition) - Atoms cannot be created nor destroyed in a chemical reaction (Law of Conservation of Matter) Atomic Structure - J.J. Thompson (1897) discovered cathode ray, a stream of electrons, by applying a charge to two electrons in an evacuated glass tube - Robert Millikan (1909) used Thompson’s data to calculate the charge and mass of an electron in his Oil Drop -19eriment 8 -28 - Electron mass = 1.60x10 C/1.76x10 C/g = 9.10939x g - Henri Berquierel, Marie and Piere Currie, discovered atomic level disintegration called radioactivity - JJ Thompson Plum Pudding model - Ernest Rutherford (1910) alpha particle scattering experiment, proved existence of dense positive nucleus in center of the atom, while also disproving Plum Pudding Model - Ernest Rutherford (1919) discovered the proton - James Chadwick (1932) discovered the neutron Particle S
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