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Demcritus
Democritus considered himself as the father of modern science. Claims that every atom physical but is geometrically, invisible. -
Antoine Lavoisier
A French chemist that considered himself the father of modern chemistry. Stating that "air" was responsible for combustion that could be the source of acidity. -
Law of Conservation of Mass
Established by Antoine Lavoisier, and it states that, "Mass can neither be created nor destoyed in an ordinary chemical reaction". -
John Dalton
Responsible for the basic atomic theory. Billiard Ball Model. -
Dalton's Atomic Theory
All matter is made of of atoms, and the atoms are indivisible and are industructable. -
Dmitri Mendeleev
Created the Periodic Table. He believed that the the elements had some type of order. -
Cathode Ray Tube
A stream of electrons that leave negative cathode, in a discharge tube emitted by a heated filament in certain electron tubes. -
JJ Thomson
Studied the beams of light that followed an electrical discharge in a high-vacuum tube. This research became a popular topic among physicists at the time because this was the nature of cathode rays and it was unclear until now. -
Plum Pudding Atomic Model
Is an atom model brought up by JJ Thomson. As in a plum the "pudding" is the positively charged atoms and the "dotting" was the negatively charged atoms. -
Robert Millikan
Used s source of x-rays to take out the electrons of the molecules out of the air. 1.59 x 10-19 C -
Rutherford Model
Tested the hypothesis of JJ Thomson, and it showed that the mass of the atom was spread out through the whole atom. -
Henry Moseley
Studied under Rutherford, and order the elements on the Periodic Table correctly and came closer to determine the actual number of the elements. -
Niels Bohr
Assumed that the electrons traveled at a stationary movement. -
Bohr Planetary
Was a theory of the atomic structure and it explains the spectrum of hydrogen atoms. Guessing that the electron orbited around the nucleus can happen only in certain energy states. -
Gold Foil Experiment
The gold separates the alpha particles, and the deflection of the partcles went through at large angles. The closer they get the bigger the angles get. -
Erwin Schrodinger
He studies wave mechanics, and crucial understanding the spectrum of light. -
Quantum Mechanical Model
Discovered facts about energy to propose his planetary model of the atom. The neutrons and protons are contained in a small, dense nucleus, which the electrons orbit in defined spherical orbits. -
Ernest Rutherford
Describes the atomic theory by stating the nucleus has central positive protons surrounded by the neutrons. -
James Chadwick
Predicted that the atom would have neutrons. -
Electron Cloud Model
Describes the atom as a cloud with floating protons, electrons, and neutrons.
