Atomic Theory. When looking at the History of the Atom. The Atom was always Neutral. Let’s Take a Trip Through Time!. Democritus 460 – 370 B.C. Greek Philosopher There are various basic elements from which all matter is made Coined the term “atom” which means indivisible
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When looking at the History of the Atom.
The Atom was always Neutral.
“The material cause of all things that exist is the coming together of atoms and void. Atoms are too small to be perceived by the senses. They are eternal and have many different shapes, and they can cluster together … By aggregation they provide bulky objects that we can perceive with our sight and other senses… There is no void in atoms, so they cannot be divided.”
Demokritos c. 460-370 BC
The Cannonball Model
Show the Gold Foil Experiment Animation
Quantum Energy Levels
-Atomic Model has electrons found in specific energy levels.
Werner Heisenberg 1901-1976
The accepted way we presently look at the atom
"In 1944, Seaborg formulated the \'actinide concept\' of heavy element electronic structure which predicted that the actinides – including the first eleven transuranium elements – would form a transition series analogous to the rare earth series of lanthanide elements. Called one of the most significant changes in the periodic table since Mendeleev\'s 19th century design, the actinide concept showed how the transuranium elements fit into the periodic table."
Headed the plutonium work of the Manhattan Project (1942-1946)
Co-discoverer of plutonium and all further transuranium elements through element 102
Between 1961 and 1971, Seaborg was the chairman of the AEC, a predecessor agency of the Department of Energy (DOE). Seaborg was active in national service, advising ten presidents from Franklin D. Roosevelt through George H. W. Bush.
President Truman with J. Stalin issue a ultimatum to Japan, surrender or be destroyed
Dropped bomb on Hiroshima
Dropped bomb on Nagasaki
1803 – Dalton
1897 – Thomson
Plum pudding Model
1909 – Rutherford
1913 – Bohr
Wave – Mechanical Model