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Atomic Model Timeline
Transcript of Atomic Model Timeline
Atomic Model Timeline
Aristotle’s theory made a great generalization of all matter of the four elements: fire, water, earth, and air.
He also believed that there were four qualities to these elements: dryness, hotness, coldness, and moistness.
Developed methods for the gathering of scientific fact.
Democritus of Adbera
He created the first atomic model.
Postulated the theory of atoms and void; the universe is made up of empty space and a nearly infinite number or invisible particles differing in arrangement, form, and position.
He stated that all all matter is composed of indivisible atoms
Models of atom
He discovered the atomic nucleus.
conducted the famous Geiger–Marsden experiment called the "gold foil experiment".
the discovery of the actual structure of atoms.
He did this by sampling uranium.
Robert used his oil drop experiment to discover the electron's charge independently.
He determined the charge on electrons.
He developed an explanation of atomic structure that underlies regularities of the periodic table of elements.
His atomic model had atoms built up of successive orbital shells of electrons.
He also inferred that when an electron moves from an outer orbit to an inner orbit it emits a quantum of energy, a photon, in the form of light.
He proposed an "atomic theory" with spherical solid atoms based upon measurable properties of mass.
These atoms possess unique characteristics and weight for different elements.
He also stated that three types of atoms exist: simple(elements), compound (simple molecules), and complex(complex molecules).
Theorized that atoms have their positive charge concentrated in a very small nucleus
Inferred a small, dense, positively-charged nucleus as the result of the alpha particle scattering gold foil experiment
This positively charged center was later called the nucleus.
Developed a better vacuum pump that allowed him to produce cathode-ray tubes with a smaller residual gas pressure.
He also invented the radiometer and spinthariscope.
the idea of quanta (discrete units of energy) to explain hot glowing matter.
Stated that radiation is quantized.
Published the famous equation E=mc 2
Einstein, however, showed that light also acted like a particle!
X-rays, which react with fluorescence. He therefore assumed that these X-rays were a type of electromagnetic radiation.
Realized that Hahn was splitting the Uranium nucleus,something never done before.
Conducted experiments verifying that heavy elements capture neutrons and form unstable products which undergo fission
Found that when Uranium is bombarded by neutrons it produces smaller nuclei roughly half the size of the original,Uranium nucleus.
German physical chemist and Nobel laureate, best known for his contributions in the field of radioactivity.
Glen T. Seaborg
Succeeded in making man-made elements
isolated and identified elements heavier than uranium, and in the process, added elements number 94 - 102, and 106.
First to measure the electron.
Developed the plum-pudding model of the atom,the atom as a slightly positive sphere with small electrons inside.
Developed wave mechanics which describe the behavior of quantum systems for bosons
He also proposed the wave theory of matter.
Murry Gell- Mann/George Zweig
Suggested the idea of quarks called up, down, or strange, composed of mesons and baryons, with spin 0.5 and electric charges of 2/3, -1/3, and -1/3 respectively.
brought forth the idea of "quarks", little bits of matter which when used kind of like building blocks, serve to explain some complex chemical substances.
Ancient art practice especially in the Middle Ages, devoted
chiefly to discovering a substance that would transmute the more
common metals into gold or silver, and to finding a means of
indefinitely prolonging human life.
Charles de Colomb
Formed Coulomb's Law: the force one tiny charged object
exerts on a second one is proportional to the amount of
charge on one times the amount of charge on the others
and inversely proportional to the square of the distance
Discovered the neutron.
Using alpha particles discovered a neutral atomic particle with a mass close to a proton.
provided the formula for the conservation of matter in chemical reactions, and also distinguished between an element and a compound.
A French chemist who proved the conservation of matter and explained the mysteries of fire
Pierre & Marie Curie
Pierre and Marie Curie are best known for their pioneering work in the study of radioactivity,.
which led to their discovery of the elements radium and polonium.