-
754 BCE
Discovery of the Elections
During the 1880s and '90s scientists searched cathode rays for the carrier of the electrical properties in matter. Their work culminated in the discovery by English physicist J.J. Thomson of the electron in 1897. -
460 BCE
Democritus
Democritus was an Ancient Greek pre-Socratic philosopher from Abdera, primarily remembered today for his formulation of an atomic theory of the universe. None of his work has survived -
428 BCE
Plato
Plato was a philosopher during the 5th century BCE. He dedicated his life to learning and teaching and is hailed as one of the founders of Western philosophy. -
384 BCE
Aristotle
Aristotle’s works shaped centuries of philosophy from Late Antiquity through the Renaissance, and even today continue to be studied with keen, non-antiquarian interest -
Lavoisier
Antoine Lavoisier was a French nobleman and chemist who was central to the 18th century chemical revolution and who had a large influence on both the history of chemistry and the history of biology -
John Dalton
John Dalton was an English chemist, physicist, and meteorologist. He is known for introducing the atomic atom and his research in color blindness -
Newland's Law of Octaves
Law of Octaves is the generalization that if the chemical elements are arranged by atomic weight.
Link: https://www.britannica.com/science/law-of-octaves -
Photoelectric effect
photoelectric effect, phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation. -
Discovery of Radioactivity
March 1, 1896: Henri Becquerel Discovers Radioactivity. In one of the most well-known accidental discoveries in the history of physics, on an overcast day in March 1896.
Link: https://www.aps.org/publications/apsnews/200803/physicshistory.cfm#:~:text=March%201%2C%201896%3A%20Henri%20Becquerel,drawer%20and%20discovered%20spontaneous%20radioactivity. -
Planck's Quantum Theory of Light
Planck's Quantum Theory of Light is the idea that different atoms and molecules can emit or absorb energy in discrete quantities only -
Plum Pudding Model
The plum pudding model is a historical scientific model of the atom. The plum pudding model is defined by electrons surrounded by a volume of positive charge, like negatively-charged “plums” embedded in a positively-charged “pudding" -
charge of the electron
electron is the lightest stable subatomic particle known which is considered the basic unit of electric charge -
Rutherford's Gold Foil Experiment
What is the Rutherford gold-foil 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. -
Bohr's Planetary Model
The electrons encircle and follow a specific allowable path called orbits around the nucleus of the atom. It has fixed energy.
Link: https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/05%3A_Electrons_in_Atoms/5.06%3A_Bohr%27s_Atomic_Model#:~:text=According%20to%20the%20Bohr%20model,orbits%2C%20its%20energy%20is%20fixed. -
Robert Millikan
Robert Millikan was a physicist who discovered the elementary charge of an electron using the oil-drop experiment. -
Moseley's atomic number
In 1914 Moseley published a paper in which he concluded that the atomic number is the number of positive charges in the atomic nucleus -
Discovery of the proton
Proton was discovered by Ernest Rutherford in the early 1900's.
Link: https://www.proton-therapy.org/about/history-of-proton-therapy/#:~:text=The%20proton%20was%20discovered%20by,%E2%80%9Cprotos%E2%80%9D%20which%20means%20first. -
schrodinger equation
a linear partial differential equation that governs the wave function of a quantum-mechanical system -
heisenberg uncertainty principle
Formulated by the German physicist and Nobel laureate Werner Heisenberg in 1927, the uncertainty principle states that we cannot know both the position and speed of a particle, such as a photon or electron, with perfect accuracy -
Discovery of the Neutron
In May 1932 James Chadwick announced that the core also contained a new uncharged particle, which he called the neutron -
Mendeleev's Pd. Table
Dmitri Mendeleev published a periodic table and arranged the elements known at the time in order of relative atomic mass -
The Alchemists
The Alchemist is a novel by Brazilian author Paulo Coelho which was first published in 1988. Originally written in Portuguese, it became a widely translated international bestseller