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16 Cards in this Set

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Dalton, John
English Chemist of the early 1800s who stated the FIRST ATOMIC THEORY based on experimental evidence. Predicted existence of LAW OF MULTIPLE PROPORTIONS.
Thomson, J.J.
English Chemist of 1897 who is credited with the discovery that cathode rays consist of ELECTRONS and that PROTONS are positive and 1836X the mass of electrons. ISOTOPE Neon atoms.
Rutherford, Lord
English Phycisist of 1920 who predicted the existence of the neutron. 1912-1913 brought team who discovered structure of atom with CORE AND EMPTY SPACE.
Chadwick, James
1932 repeated Bothe's work and found high energy particle with no charge and mass of proton. Protons and neutrons made of smaller particles.
Proust, Joseph
French chemist whose work was observed by Dalton. Proust observed that SPECIFIC SUBSTANCES ALWAYS CONTAIN ELEMENTS IN THE SAME RATIO BY MASS, LAW OF PROPORTIONS.
Democritus
Greek philosopher of 400 B.C. who first suggested that the world was made of empty space and atoms. Suggested atoms were smallest particles of matter and different types of atoms for different materials. Not supported by Evidence.
Millikan, Robert
American Scientist of the 1900s who accurately measured the charge on the electron and verified Photoelectric Effect Equation, and accurately measured Planck's constant.
Einstein
Explained Photoelectric Effect
Moseley, Henry
English scientist who in 1913 studied X-ray tubes to determine the number of protons in an atom. ATOMIC NUMBER- Z
Protons Identify elemnt, neutrons identify isotopes.
Bohr
Worked in Rutherfords 1912-13 team to discover atom's structure. Rutherford-Bohr model= Planetary Atomic Model
Planck, Max
German physicist assumed energy was given off in little packets "quanta." QUANTUM THEORY. energy directly related to light emitted. E=hv
Avogadro, Amadeo
Italian phycisist of 1800s who explain Gay-Lussac's observation using Dalton's theory. Equal volmes of gases under the same conditions, have the same number of molecules. Sped acceptance of Dalton's Theory.
Lavoisier, Antoine
French Chemist whose ideas that IN ORDINARY CHERMICAL REACTIONS MATTER IS NEITHER CREATED OR DESTROYED, JUST CHANGED (LAW OF CONSERVATION OF MASS), were observed by Dalton.
Gay-Lussac, J.L.
French Chemist of 1800s who observed that gas reactions under same conditions have volumes in the ratio of whole numbers.
Becquerel, Henri
French physicist in 1896 found matter containing Uranium exposed film, led Marie Curie to discovery of Radioactive Isotopes.
Geiser, Hans and Marsden, Ernest
On Rutherford's 1912-13 team and used thin gold to discover that most of atom was empty space with small hard core.