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428 BCE
Plato
According to Plato, reality exists away from the material world, within the world of forms, which can only be viewed with the eye of the mind. -
392 BCE
Democritus
Democritus was known for coming up with the idea that central figure in the development of the atomic theory of the universe. -
382 BCE
Aristotle
Aristotle was widely famous because his studies of realism went against Plato's ideas which caused a lot of confusion for sciencest at the time -
Lavoisier
Lavoisier was the one discovered combustion and respiration, proving the law of conservation. -
John Dalton
in 1803 John Dalton was the one that introduced the idea of Atomic theory into chemistry and for his work on human optics. -
The Alchemists
The alchemists believed that all metals were formed from two principles mercury and sulfur. -
Newlands Law of Octaves
In 1865 an English Scientist in Newlands, discovered that when chemical elements are arranged in the correct way to make the atom increase weight, those chemical and physical properties occur after each interval of seven elements. -
Mendeleev's Pd. Table
Mendeleev realized that that physical and chemical properties of elements were the same as atomic mass in a periodic way. -
Photoelectric Effect
The Photoelectric Effect is when an electrically charged particles are released from or within a material when it absorbs electromagnetic radiation. -
Discovery of Radioactivity
Henri Becquerel in 1896 was looking at x-ray images when he suddenly discovered Radioactivity by mistake. -
Discovery of the electrons
Joseph John Thomson is known for being able to discovery one of the most import things in science the electron. -
Planck's Quantum Theory of Light
According to Planck's quantum study's Different atoms and molecules can emit or absorb energy in discrete quantities only -
Plum Pudding Model
The Plum Pudding Model is defined by electrons surrounded by volume of positive charges. -
Rutherford's Gold Experiment
A piece of gold foil was hit with alpha particles, which have a positive charge. Most alpha particles went right through. This showed that the gold atoms were mostly empty space. -
Charge of the Electron
The electron lightest stable is a negative charge of 1.602176634 × 10−19 coulomb which is a basic unit of an electron charge. -
Bohr's Planetary Model
The Bohr's Model is structural model of an atom which is designed for the electron to travel around the nucleus of the atom. -
Mosley's Atomic Number
In 1914 Mosley published a newspaper that stated that the atomic number is the number of positive charges in the atomic nucleus. He also said that there are unknow elements 43, 61, and 75. -
Discovery of the proton
in early 1900's Ernest Rutherford discovered that by splitting an atom proton would be released. -
Schrodinger Equation
The Schrodinger equation plays the role of Newton's laws and conservation of energy in classical mechanics -
Heisenberg Uncertainty Principle
The uncertainty principle implies that it is in general not possible to predict the value of a quantity with arbitrary certainty, even if all initial conditions -
Discovery of the Neutron
By 1920, physicists knew that most of the mass of the atom was located in a nucleus at its center and In May 1932 James Chadwick announced that the core also contained a new uncharged particle, which he called the neutron. -
Robert Millikan
Robert Millikan was able to prove accurately determination of the charge carried by an electron using fall drop method.
