FINISHED_Final_Notebook_Jones

Research the Scientist and summarize their contributions to the Atomic Theory
Antoine Henri Becquerel
First person to discover radioactivity (SI unit for radioactivity is the becquerel [Bq])
Niels Bohr
Developed the Bohr Model (orbit model of the atom where electrons can only reside in specific energy levels)
Louis de Barogilie
Broglie hypothesis: proposed that all matter has wave properties
Glenn Seaborg
Hantaro Nagaoka
Democritus
Marie and Pierre Curie
Eugene Goldstein
Dmitri Mendeleev
His work led to development of the actinide concept & the arrangement of the actinide series.
Seaborg was the principal or co-discoverer of ten elements: plutonium, americium, curium, berkelium,
californium, einsteinium, fermium, mendelevium, nobelium and element 106
Believed center of atom was highly positively charged mass which established stable electron orbits
(developed Saturnian model)
Created his own theory: everything is composed of "atoms", which are physically indivisible, there is empty space
between atoms, they are indestructible, are constantly & always have been in motion, infinite kind of atoms & number
of atoms, which differ in shape and size.
Discovery of radioactivity (alongside Antoine Becquerel) & two radiocative elements
Developed "The Curie" (a measure of radioactivity)
Discovered the anode ray (beam of positive ions that is created by certain types of gas discharge tube)
Also discovered the proton.
. He formulated the Periodic Law, created a farsighted version of the periodic table of elements, and used it to
correct the properties of some already discovered elements.
J.J. Thomson
Discovered cathode rays of negative particles (which he termed as electrons), developed Plum Pudding model
James Chadwick
Discovery of neutron
Erwin Shrodinger
Developed Quantum Field Theory, expanded upon the quantum mechanical model made by Barogilie
John Dalton
Lothar Meyer
Robert Millikan
Proposed an atomic theory, the main points of which were: Elements are made of atoms, atoms of an element are
identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties,
atoms cannot be subdivided, created, or destroyed. Atoms of different elements combine simple whole-number
ratios to form chemical compounds
Best known for his part in the periodic classifcation of the elements (or the periodic table), and he worked with Mendeleev & Bunsen
Determined the charge of one electron and using the known mass-charge ratio, and was able to calculate the
mass in one electron. Discovered photoelectric effect, and conducted the oil drop experiment.
J.W. Dobereiner
Worked on periodic trends and the periodic law
Ernest Rutherford
Performed the gold foil experiment - discovered that the mass and positive charge of an atom is in the
nucleus.
Discovered the concept of radioactive half-life
Created the Rutherford model of the atom
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