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300
Aristotle, 350 BC
He was a Greek philosopher and polymath, a student of Plato and teacher of Alexander the Great. He was more famous than Democritus, gaining everybody's trust. He disagreed with Democritus' atomic theory and said all things were made of 4 elements.
*Source: Wikipedia, Chemistry notes -
400
Democritus, 400 BC
He was an Ancient Greek philosopher born in Abdera, Thrace, Greece. He was an influential pre-Socratic philosopher who formulated an atomic theory for the universe. He said that everything is made up of matter so small that it can't be broken down aymore. (Atoms)
*Source: Wikipedia, Chemistry notes -
Antoine Lavoisier
He was a French nobleman and chemist central to the 18th-century Chemical Revolution and a large influence on both the histories of chemistry and biology. He is widely considered to be the "Father of Modern Chemistry."
He recognized the name oxygen and hydrogen and opposed the phlogiston theory. He helped construct the metric system, wrote the first extensive list of elements, and helped to reform chemical nomenclature. He predicted the existence of silicon.
*Source: Wikipedia -
John Dalton
He revived the idea of atoms. Says that Democritus was right after all.
*Source: Chemistry notes -
Amadeo Avogardo
He got credit for the word "molecule". He said that when atoms mix together in fixed proportions, they become a molecule. He also said that atoms and molecules are always on the move.
*Source: Chem. notes -
Wilhelm Rontgen
He was a German physicist, who, on 8 November 1895, produced and detected electromagnetic radiation in a wavelength range today known as X-rays or Röntgen rays.
*Source: Wikipedia -
Henri Berquerel
He was a French physicist, Nobel laureate, and the discoverer of radioactivity along with Marie Curie and Pierre Curie.
*Source: Wikpedia -
Marie & Pierre Curie
They found radium an polonium. Also developed a way to refine different substances.
*Source: nobelprize.org, chemistry notes -
Joseph Thomson
He was a British physicist. In 1897, Thomson showed that cathode rays were composed of a previously unknown negatively charged particle, and thus is credited with the discovery and identification of the electron. Thomson is also credited with finding the first evidence for isotopes of a stable (non-radioactive) element in 1913 as part of his exploration into the composition of canal rays (positive ions) and with the invention of the mass spectrometer.
*Source: Wikipedia
*Source: Wikipedia -
Max Planck
He was a German theoretical physicist who originated quantum theory.
*Source: Wikipedia -
Albert Einstein
He discovered E=mc^2. Everything has a lot of energy.
*Source: Chem. notes -
Neils Bohr
He was a Danish physicist who made foundational contributions to understanding atomic structure and quantum mechanics.
*source: wikipedia -
Erwin Shrodinger
He was an Austrian physicist who developed a number of fundamental results in the field of quantum theory, which formed the basis of wave mechanics: he formulated the wave equation (stationary and time-dependent Schrödinger equation) and revealed the identity of his development of the formalism and matrix mechanics.
*Source: wikipedia
*Source: wikipedia -
Lise Meitner
Lise was an Austrian, later Swedish, physicist who worked on radioactivity and nuclear physics. Meitner was part of the team that discovered nuclear fission, an achievement for which her colleague Otto Hahn was awarded the Nobel Prize.
*Source: wikipedia -
James Chadwick
He was an English physicist who was awarded the 1935 Nobel Prize in physics for his discovery of the neutron in 1932. He was the head of the British scientists who worked on the Manhattan Project during World War II.
*Source: wikipedia -
Otto Hahn
Otto Hahn was a German chemist and pioneer in the fields of radioactivity and radiochemistry who won the Nobel Prize in Chemistry for the discovery of nuclear fission.He is regarded as one of the most significant chemists of all times and especially as "the father of nuclear chemistry".
*source: wikipedia -
Glenn T. Seaborg
Glenn was an American scientist who won the 1951 Nobel Prize in Chemistry for "discoveries in the chemistry of the transuranium elements", contributed to the discovery and isolation of ten elements, and developed the actinide concept, which led to the current arrangement of the actinide series in the periodic table of the elements.
*Source: wikipedia -
Murray Gell-Mann
He is an American physicist who received the 1969 Nobel Prize in physics for his work on the theory of elementary particles. He introduced the quark constituents of all hadrons, having first identified the SU(3) flavor symmetry of hadrons, now understood to underlie the light quarks, extending isospin to include strangeness, a quantum number which he also discovered.
*Source: wikipedia -
Electron Cloud of Probability
The electron cloud model is an atom model wherein electrons are no longer depicted as particles moving around the nucleus in a fixed orbit. Instead, as a quantum mechanically-influenced model, we shouldn’t know exactly where they are, and hence describe their probable location around the nucleus only as an arbitrary ‘cloud’.
*Source: universetoday.com
