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427 BCE
Plato
During the Classical era of ancient Greece, the philosopher Plato was born in Athens. He established the Academy, the first university on the European continent, as well as the Platonist school of philosophy. He discovered the atomic theory. -
400 BCE
Aristotle
He established the field of formal logic, named the numerous branches of science, and looked into the connections between them. -
400 BCE
Democritus
A crucial contributor to the atomic hypothesis of the universe was Democritus. He proposed the idea that every material body is composed of tiny, independent "atoms." -
Lavoisier
He is famous for thediscovery of the role oxygen plays in combustion -
The Alchemists
The alchemists held 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 (rusting). -
John Dalton
According to Dalton's atomic hypothesis, every piece of matter is made up of separate, unbreakable atoms with unique weights and properties. -
New Land of Octaves
When Elements are arranged in increasing order of Atomic Mass, the properties of every eighth Element starting from any Element are a repetition of the properties of the starting Element. -
Mendeleev's Pd. Table
Element properties are a periodic function of their atomic weight. -
Discovery of Radioactivity
Radioactivity is discovered by Henri Becquerel. Henri Becquerel, a French physicist, opened a drawer on an overcast day in March 1896 and found spontaneous radioactivity, one of the most famous accidental discoveries in the history of physics. -
Discovery of the 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. -
Charge of the Electron
Because atoms as a whole are electrically neutral, J.J. Thomson's discovery of the negatively charged electron presented physicists with theoretical issues as early as 1897. -
Plum Pudding Model
The plum pudding model, commonly referred to as Thomson's plum pudding model, is a traditional atomic model. -
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. -
Planck's Quantam Theroy of Light
Different atoms and molecules can only discretely release or absorb energy, according to Planck's theory of quantum mechanics. -
Rutherford's Gold Foil Experiment
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. -
Robert Millikan
His first significant achievement was the precise calculation of an electron's charge using the elegant "falling-drop method," together with the demonstration that this number was a constant for all electrons. -
Bohr's Planetary Model
The Bohr model, often known as a planetary model, states that the electrons orbit the atom's nucleus in predetermined, legal directions. The energy of the electron is fixed when it is in one of these orbits. -
Mosley's Atomic Number
The quantity of positive charges in the atomic nucleus is what determines an atom's number, according to a study written by Moseley in 1914. Between aluminum and gold, he added, 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. -
Heisenberg Uncertainty Principal
The uncertainty principle, which was created by German physicist and Nobel winner Werner Heisenberg in 1927, asserts that we cannot accurately know a particle's position and speed at the same time; -
Discovery of the Neutron
James Chadwick stated in May 1932 that a new uncharged particle, which he named the neutron, was also present in the core. In the year 1891, Chadwick was born in Manchester, England.