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428 BCE
Plato
Plato founded the Academy, an academic program which many consider to be the first Western university. Plato also wrote many philosophical texts. -
400 BCE
Democritus
Democritus was a central figure in the development of the atomic theory of the universe. He thought that all material bodies are made up of singular small atoms. -
322 BCE
Aristotle
Greek philosopher and scientist who wrote about virtually every area of knowledge, including most of the sciences. -
Robert Boyle
the person who discovered that the volume of a gas decreases with increasing pressure and vice versa which is called the famous Boyle's law. -
The Alchemists
Alchemists made all sorts of materials for commerce, including medicines, pigments, metallic alloys, perfumes and cosmetics. -
John Dalton
John Dalton formulated a new atomic theory to explain chemical reactions, upon which much of modern chemistry and physics is based. -
Newland's Law Of Octaves
When elements are arranged in order of increasing atomic mass. It is only true for elements up to calcium. gives a basis for the classification of an element having similar properties into groups of elements. -
Mendeleev's Pd. Table
Mendeleev's original periodic table claimed the famous periodic law that “Element properties are a periodic function of their atomic weight.” -
Photoelectric Effect
Photoelectric effect is where electrically charged particles are released from or within a material when it absorbs electromagnetic radiation. -
Discovery of Radioactivity
The radioactivity of uranium was discovered by Henri Becquerel who, starting from a wrong idea, progressively realized what he was observing and announced it. -
Planck's Quantum Theory of Light
According to Planck's quantum theory, Different atoms and molecules can emit or absorb energy in discrete quantities only. -
Robert Millikan
Robert Millikan is known for discovering value of the elementary charge, which is the charge on a single electron. -
Rutherford's Gold Foil Experiment
Ernest Rutherford studied the absorption of radioactivity by thin sheets of metal foil and found two components: alpha radiation, which is absorbed by a few thousandths of a centimeter of metal foil, and beta radiation, which can pass through 100 times as much foil before it was absorbed. -
Bohr's Planetary Model
The model was proposed by Niels Bohr. It is when electrons travel around the nucleus of an atom in distinct circular orbits, or shells. -
Mosley's Atomic Numbers
Moseley believed that the atomic number is the number of positive charges in the atomic nucleus. this fundamental discovery concerning atomic numbers was a milestone in advancing the knowledge of the atom. -
Discovery of the Proton
Ernest Rutherford discovered the proton; he proved that the nucleus of the hydrogen atom is present in the nuclei of all other atoms.. -
Schrodinger Equation
The Schrodinger equation gives a detailed account of the form of the wave functions or probability waves that control the motion of some smaller particles. -
Heisenberg Uncertainly Principle
Heisenberg Uncertainly Principle is the more accurately one property is measured, the less accurately the other property can be known. -
Discovery of the Neutron
the physicist James Chadwick conducted an experiment in which he put Beryllium with alpha particles from the natural radioactive decay of Polonium which is how neutrons were discovered. -
Plum Pudding Model
It is a historical model of atom. The plum pudding model has electrons surrounded by a volume of positive charge, like negatively charged "plums" embedded in a positively charged "pudding".