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460 BCE
Democritus Life Span and Facts
Life Span was from 460 BC to 370 BC. Some Democritus interesting facts are, Even before Socrates, Democritus—along with his teacher—had developed a theory that all elements are made up of atoms.He also made contributions to the studies of math and sciences such as biology and anthropology. -
400 BCE
Democritus Contribution
Democritus lived in Abdera, Greece. He suggested that matter was made up of atoms. Democritus atomic model looked like a homogenous solid that looks like a billiard."Atoms" in Greek means "indivisible." Democritus called his discovery this because he believed that the atom was unbreakable into smaller parts. To initially find the atom, Democritus conducted a simple experiment that can still be done today. -
Antioine Lavoisier Facts and Life Span
Life Span was from August 26, 1743 to May 8, 1794. Some Antoine interesting facts are that Antoine Lavoisier is famous for the oxygen theory of combustion.He discovered the composition of oxygen and hydrogen.Antoine Lavoisier also had studied and predicted the existence of silicon. He also had a penchant for accuracy. This was instrumental in the formulation of the metric system of measures and weights and is still widely in use today. -
John Dalton Facts and Life Span
Life Span was from September 6,1766 to July 27,1844. Some interesting Dalton facts is that Dalton's research had a tremendous impact on the atomic theory, as his work on the physical properties of different gases required there to be a physical structure to atoms. Another fact, Dalton's interpretation of atomic theory maintained that atoms are combined in chemical reactions, but also that they can be separated and rearranged. -
Antoine Lavoisier Contribution
Antoine Lavoisier lived in Paris,France.He contributed the Law of Conservation of Matter. The first breakthrough in the study of chemical reactions resulted from the work of the French chemist, Antoine Lavoisier between 1772 and 1794. Lavoisier found that mass is conserved in a chemical reaction.However, philosophical speculation and even some quantitative experimentation preceeded him.He was certainly not the first to accept this law as true or to teach it,but he is credited as its discoverer. -
John Dalton Contribution
John Dalton lived in Eaglesfield, Cumbria, United Kingdom, but died in Manchester.Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.John Dalton proposed a modern theory of the atom based on the following assumptions. 1. Matter is made up of atoms that are indivisible and indestructible. 2. All atoms of an element are identical. -
J.J.Thomson Life Span and Facts
Life Span was from December 18, 1856 to August 30, 1940. Some JJ Thomson facts include that On June 12,1884 he was elected Fellow of the Royal Society and on December 22 of that year became Cavendish Professor of Physics at the University of Cambridge. Another fact is that In 1906 he demonstrated that hydrogen had only one electron per atom. -
Ernest Rutherford Life Span and Facts
Life Span was from August 30,1871 to October 19,1937.Some interesting facts about Ernest is that Element 104, rutherfordium, is named after him. Another fact is, Despite his designation as the father of nuclear physics, he was awarded the Nobel Prize for Chemistry in 1908. -
Niels Bohr Life Span and Facts
Life Span was from October 7, 1885 to November 18,1962. Some interesting Niels facts were that Bohr won a gold medal from the Royal Danish Academy of Sciences and Letters for this research, which he later improved on and republished. Another one is that Bohr was one of the first to finalize a model that demonstrated electrons orbiting the nucleus of an atom, expanding on Charles Darwin's earlier work. -
Erwin Schrödinger Life Span and Facts
Life Span from August 12, 1887 to January 4,1961. Some Facts about him is that he received the Nobel Prize in Physics and shared it with Paul Adrien Maurice Dirac. Another fact is that Erwin was heavily influenced by Schopenhauer. -
James Chadwik Life Span and Facts
Life Spans was from October 20,1891 to July 24, 1974. Some interesting Chadwick facts is his discovery of the neutron earned him the Nobel Prize in physics in 1935. Another fact is his method to discover the neutron was later used in the nuclear test where the first atomic bomb was detonated. He witnessed the event. -
Werner Heisenberg Life Span and Facts
Life Span was from December 5, 1901 to February 1,1976. Some facts about him would include that he was nominated for the Nobel Prize by Albert Einstein and eventually awarded the Nobel Prize in Physics in 1932 for the 'creation of quantum mechanics'. He Is also the recipient of the Max Planck Medal in 1933. Another fact is that he made notable contribution to the fields of hydrodynamics of turbulent flows, the atomic nucleus, ferromagnetism, cosmic rays, and subatomic particles. -
J.J. Thomson Contributions
JJ Thomson lived in Cheetham Hill, United Kingdom. Development of the Atomic Theory. In 1897, J.J. Thomson discovered the electron by experimenting with the cathode ray tube.He demonstrated that cathode rays were negatively charged.The Plum Pudding model represented an attempt to consolidate the known properties of atoms at the time: 1) electrons are negatively-charged particles and 2) atoms are neutrally-charged. -
Ernest Rutherford Contribution
Ernest lived in England ,Canada and Nelson, New Zealand. Rutherford overturned Thomson's model in 1911 with his well-known gold foil experiment, in which he demonstrated that the atom has a tiny, heavy nucleus. Rutherford designed an experiment to use the alpha particles emitted by a radioactive element as probes to the unseen world of atomic structure. -
Niels Bohr Contribution
Niels lived in Copenhagen, Denmark.In 1913, Niels Bohr proposed a theory for the hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities. Electrons should move around the nucleus but only in prescribed orbits. When jumping from one orbit to another with lower energy, a light quantum is emitted. Experiment with Planetary model. -
Erwin Schrödinger Contribution
Erwin lived in Vienna, Austria and Berlin,Germany. In 1926, Schrödinger used mathematical equations to the show probability of detecting the position of electrons.The Quantum mechanical mode of atom. This was influence by Bohr's model to predict the location of electrons using mathematical equations. -
Werner Heisenberg Contribution
Werner lived in Wurzburg,Germany.His contribution to the atomic theory was that he calculated the behavior of electrons,and subatomic particles that also make up an atom.This idea brought math more into understanding the patterns of an atom's electrons.In 1925, Werner Heisenberg formulated a type of quantum mechanics based on matrices. In 1927 he proposed the "uncertainty relation", setting limits for how precisely the position and velocity of a particle can be simultaneously determined. -
James Chadwik Contribution
James lived in Bollington,England and Manchester,United Kingdom.He discovered the Neutron in atoms.Neutrons are located in the nucleus along with the protons.They have neither a positive or a negative charge. James Chadwick bombarded beryllium atoms with alpha particles. An unknown radiation was produced. Chadwick interpreted this radiation as being composed of particles with a neutral electrical charge and the approximate mass of a proton. This particle became known as the neutron.
