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500 BCE
The Alchemists
Developed knowledge about matter. -
460 BCE
Democritus
Large contributor in the development of the atomic theory of the universe. -
428 BCE
Plato
He founded the Academy. He also wrote lots of philosophical texts. -
384 BCE
Aristotle
He made major contributions to to philosophy and science. He invented formal logic and identified the relationships between scientific disciplines. -
Lavoisier
Discovered mass gets conserved during a chemical reaction. -
John Dalton
He introduced the atomic theory. -
Newlands Law of Octaves
This law provides a basis for the classification of elements that are similar into groups of elements. It was the first to link elements properties to their atomic masses. This system works best on elements that are lighter. -
Robert Millikan
Confirmed the most scientific thoughts at the time. -
Mendeleev's Pd. Table
It is used to identify elements and predict their properties. -
Photoelectric Effect
This effect demonstrated that light has qualities made of particles. -
Discovery of Radioactivity
Radioactivity is the source for heat in satellites and medical procedures/ cancer treatments. -
Discovery of the Electron
The electron plays an important role in thermal conductivity, electricity, chemistry, and magnetism. -
Planck's Quantum Theory
Explained the nature of the energy that is in electromagnetic waves. -
Plum Pudding Model
The Plum Pudding Model represents the important step in development of atomic theory. -
Charge of the Electron
Was seen as a turning point when it came to physics. It was important for explaining the chemical bond. -
Rutherford's Gold Foil Experiment.
This model was used to show the nuclear model of an atom. -
Bohr's Planetary Model
A system a small and dense nucleus that is surrounded by electrons. It provided a justification for the physical constants that make up a formula's results. -
Mosley's Atomic Numbers
Proved that the atomic number is more relevant than atomic mass. -
Discovery of the Proton
The proton was discovered by Ernest Rutherford. The discovery of the proton allowed people to get insight on the structure of the atom. -
Schrodinger Equation
Helped detect the location of the electron. -
Heisenberg Uncertainty Principle
This gave physicists a better understanding of how things function in the subatomic scale. -
Discovery of the Neutron
This discovery made it possible to develop the atomic bomb.