-
427 BCE
Plato
The Republic, Plato's most well-known work, describes an enlightened community ruled by a philosopher. He is particularly well known for his dialogues (early, middle, and late), which demonstrate his metaphysical theory of forms. -
400 BCE
Aristotle
He founded the field of formal logic, made groundbreaking contributions to all areas of philosophy and science, and identified and examined the connections between the numerous scientific disciplines. In addition to being a philosopher, Aristotle was also a teacher and established the Lyceum in Athens. -
400 BCE
Democritus
Democritus was an ancient Greek philosopher mainly remembered today for his formulation of an atomic theory of the universe -
500
The Alchemists
The alchemists said that sulfur and mercury were the two basic building blocks from which all metals were created. The fluidity and flammability of mercury, two fundamental properties, are what gave origin to metals' malleability. The Sulphur provided body and calcination due to its vital trait of combustibility. -
Lavoisier
The law of conservation was established, the French chemist Antoine Lavoisier, who is regarded as the "father of modern chemistry," was also primarily responsible for the discovery of hydrogen and the role of oxygen in respiration and combustion. -
John Dalton
According to Dalton's atomic theory, all matter is made up of indivisible, unbreakable atoms that each have a unique mass and set of characteristics, the sum of which determines the physical makeup of the components that make up the matter. -
Newland's Law Of Octaves
The law of octaves is a generalization in chemistry that states that if chemical elements are ordered in order of increasing atomic weight, those with comparable physical and chemical properties follow intervals of seven elements. J.A.R. Newlands of England formulated this generalization in 1865. -
Mendeleev's Pd. Table
A Russian chemist by the name of Dmitri Mendeleev published a periodic table in 1869, just five years after John Newlands proposed his Law of Octaves. Mendeleev also ordered the elements at the time in order of relative atomic mass, but he also accomplished other feats that significantly improved his table. -
Photoelectric Effect
When a substance absorbs electromagnetic radiation, a phenomenon known as the photoelectric effect causes electrically charged particles to be discharged from or within the material. When light strikes a metal plate, the action is frequently described as the ejection of electrons from the plate. -
Discovery of Radioactivity
Henri Becquerel discovers radioactivity on March 1st, 1896. Henri Becquerel, a French physicist, accidentally discovered spontaneous radioactivity in a drawer on a cloudy day in March 1896, making it one of the most well-known accidental discoveries in the history of physics. -
Discovery Of Electron
Scientists looked for the carrier of the electrical qualities in matter in cathode rays in the 1880s and 1890s. Their efforts culminated in the 1897 discovery of the electron by English physicist J.J. Thomson. -
Planck's Quantum Theory Of light
In order to ensure that the majority of the energy is released as visible waves, light bulb filaments should be heated to a temperature of roughly 3,200 Kelvin, according to Planck's quantum theory of fussy light. Much hotter, and the ultraviolet radiation would cause us to begin tanning. -
Plum Pudding Model
The plum pudding model, commonly referred to as Thomson's plum pudding model, is a traditional atomic model. According to the "plum pudding" model, electrons are enclosed in a region of positive charge, just like negatively charged "plums" are contained within positively charged "pudding." -
Charge Of The Electron
Robert Millikan, who discovered the electron's charge, was awarded the 1923 Nobel Prize in Physics. Using negatively charged oil droplets, American scientist R. Millikan determined the charge of an electron in 1909. -
Rutherford's Gold Foil Experiment
The Rutherford gold-foil experiment: what is it? The positive-charged alpha particles struck a piece of gold foil. Most alpha particles passed through unharmed. This demonstrated that the gold atoms primarily consisted of empty space. -
Bohr's Planetary Model
The electrons orbit the atom's nucleus in accordance with the Bohr model, also known as a planetary model, which specifies the permitted directions in which they can travel. A definite amount of energy is present while the electron is in one of these orbits. -
Robert Millikan
The oil-drop experiment was used by physicist Robert Millikan to determine the fundamental charge of an electron. -
Mosley's Atomic Numbers
The quantity of positive charges in the atomic nucleus, according to a study written by Moseley in 1914, is what determines the atomic number. In addition, he claimed that between aluminum and gold, there were three undiscovered elements with the atomic numbers 43, 61, and 75. -
Discovery Of The Proton
Ernest Rutherford made the discovery of the proton in the early 1900s. He discovered protons during this time when his research led to a nuclear reaction that caused the first 'splitting' of the atom. Based on the Greek term "protos," which meaning first, he gave his finding the name "protons." -
Schrodinger Equation
The wave function of a quantum mechanical system is controlled by the Schrödinger equation, which is a linear partial differential equation. It is an important outcome in quantum mechanics, and its discovery represented a turning point in the field's evolution. -
Heisenberg Uncertainty Principle
The uncertainty principle, which was developed by German physicist and Nobel laureate Werner Heisenberg in 1927, states that we cannot accurately determine both a particle's position and speed, such as that of a photon or electron; rather, the more precisely we can determine the particle's position, the less we can determine its speed, and vice versa. -
Discovery Of the Neutron
Neutrons were found in 1932 by the British physicist Sir James Chadwick. For this discovery, he received the 1935 Nobel Prize in Physics. It's crucial to remember that Ernest Rutherford first proposed his theory of the neutron in the year 1920.