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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 -
429 BCE
Plato
Plato was an ancient Greek philosopher born in Athens during the Classical period. -
384 BCE
Aristotle
Aristotle was an Ancient Greek philosopher and polymath. His writings cover a broad range of subjects spanning the natural sciences, philosophy -
Robert Boyle
Robert Boyle FRS was an Anglo-Irish natural philosopher, chemist, physicist, alchemist and inventor. Boyle is largely regarded today as the first modern chemist. -
John Dalton
John Dalton FRS was an English chemist, physicist and meteorologist. He is best known for introducing the atomic theory into chemistry, and for his research into color blindness, which he had. Color blindness is known as Daltonism in several languages, being named after him. -
Medeleevev"s Pd. Table
Mendeleev arranged elements in rows by increasing atomic mass. Within a row, elements with lower atomic masses were on the left. -
Newland's Law of Octaves
John Newlands attempted the 62 elements known at that time. He arranged them in an ascending order based on their atomic masses and observed that every 8th element had similar properties. -
Robert Millikan
Robert Andrews Millikan was an American experimental physicist who won the Nobel Prize for Physics in 1923 for the measurement of the elementary electric charge and for his work on the photoelectric effect. -
Photoelectric Effect
1887 by the German physicist Heinrich Rudolf Hertz. In connection with work on radio waves, Hertz observed that, when ultraviolet light shines on two metal electrodes with a voltage applied across them -
Discovery of Radioactivity
By accident, he discovered that uranium salts spontaneously emit a penetrating radiation that can be registered on a photographic plate. -
Planck's Quantum Theory of Light
Planck's constant (h) is the constant that relates them. Albert Einstein determined that light is made up of discrete quanta of energy called photons as a result of his research. -
Plum Pudding Model
Thomson's plum pudding model of the atom, the electrons were embedded in a uniform sphere of positive charge, like blueberries stuck into a muffin. -
Ruthfords Gold Foil Experiments
gold foil experiment. A beam of alpha particles was aimed at a piece of gold foil. Most alpha particles passed through the foil, but a few were scattered backward. This showed that most of the atom is empty space surrounding a tiny nucleus. -
Bohr's Planetary model
Bohr model, description of the structure of atoms, and hydrogen. -
Mosley's Atomic Numbers
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
The discovery of the proton is credited to Ernest Rutherford, who proved that the nucleus of the hydrogen atom. -
Schrodinger Equation
The Schrödinger equation is a linear partial differential equation that governs the wave function of a quantum-mechanical system. -
Heisenberg Uncertainty Principle
a fundamental concept in quantum mechanics. It states that there is a limit to the precision with which certain pairs of physical properties -
Discovery of the Neutron
James Chadwick fired alpha radiation at beryllium sheet from a polonium source. This led to the production of an uncharged, penetrating radiation. -
The Alchemists
The Alchemist is a novel by Brazilian author Paulo Coelho which was first published in 1988. Originally written in Portuguese.