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Period: 100 to
Atomic Theory
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Period: 100 to 101
Democritus
Greek philosopher that worked in astronomy and theology. -
John Dalton
For over 2000 years most believed, as did Aristotle, that everything was made of four elements: earth, air, faire and water.
John Dalton changed this thinking and based his theory on expierments. Dalton believed that all matter is made of atoms. Atoms are indivisible and indestructable. all atoms of a given element are identical in mass and properties. Compounds are formed bya combination of two or more different kinds of atoms. a chemical reaction is a rearrangment of atoms. -
Ernest Rutherford
Rutherford was a former student of Thomson. He won the Nobel Prize In Chemisty in 1908. Ruther found that Thomson's atomic model was incorrect.He used thin gold foil and alphar partclies to determine two things. -
J.J Thomson
Thomson was the first scientist to discover that atoms consisted of smaller subatomic particles. He won the 1906 Nobel Prize in Physics. thomson found that there was a positive and negative portion of atoms. Thomson called the negative particles electrons. Thomson experimented with a device known as a Cathode Ray tube. -
Period: to
Joesph John J.J Thompson
Thomson was the first scientist to discover that atoms consisted of smaller subatomic particles. He won the 1906 Nobel Prize in Physics. Thomson found that there was a positive and Negative portion of atoms. Thomson called the negative particles electrons.Thomson experimented with a device known as a Cathode Ray tube. He proposed a model similar to a Chocolate Chip Cookies (plum pudding). -
Mac Planc or Mac Planck
Mac Planc was a German theoretical physicist who originated quantum theory, which won him the Nobel Prize in Physics in 1918. -
Neils Bohr
Bohr refined Rutherford's model. won the 1922 Nobel Prize in Physics. Bohr proposed electrons: orbit the nucleus without losing energy;could move only in fixed orbits of specific energies. electrons with low energy would orbit close to the nucleus whilke electrons with high energy orbit further from the nucleus. Bohr's model was based on mathematics and experimentation. Later, James Chadwick found evidence of another nuclear particle called the nucleus. -
Francis Aston
Francis William Aston FRS was a British chemist and physicist who won the 1922 Nobel Prize in Chemistry for his discovery, by means of his mass spectrograph of isotopes. -
Paul Dirac
Paul Dirac was english theoretical physicist who made fundamental contributions to the early development of both quantum mechanics and quantum electrodynamics. Dirac won the Nobel Prize in Physics in1933 with Erwin Schrödinger for the discovery of new productive forms of atomic theory. -
Werner Heisenburg
Werner Karl Heisenberg was a German theoretical physicist and one of the key creators of quantum mechanics. He published his work in 1925 in a breakthrough paper. -
Louis de Broglie
Louis de Brogile was a french physicist who made groundbreaking contributions to quantum theory. In his 1924 PhD thesis he postulated the wave nature of electrons and suggested that all matter has wave properties. -
Democritus
Democritus was Greek philospher. He was credited with naming particales atoms. Democritus believed that the atoms were defenite in number, always moving, could combine with other atoms and each substance had atoms of unique shape and size. -
Erwin Schrodinger
Erwin Rudolf Josef Alexander Schrödinger was an Austrian physicist who developed a number of fundamental results in the field of quantum theory. He was the author of many works in various fields of physics: statistical mechanics and thermodynamics, physics of dielectrics, color theory, electrodynamics, general relativity, and cosmology, and he made several attempts to construct a unified field theory. In his book "What is Life?" he talks about genetics.
