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400
Democritus
Found the atom all atoms are indivisible atom deride from atoms atomos is Greek for indivisible. -
500
"Alchemist"
A Person involved with alchemy which is the beginning type of science where modern chemistry was believed to come from. -
Coulomb
Sensitive Apparatus to measure the electrical forces involved in Priestley's law. -
Antoine Lavoisier
He became the father of modern chemistry. He invented the system of chemical nomenclatur,e still largely in use today. -
John Dalton
He proposed the atomic theory with spherical solid masses in motion. atoms can't be made or destroyed. -
Michael Faraday
Studdied the effect of electricity on solutions developed laws of electrolysis. -
Dmitri Mendeleev
Arranged elements into 7 groupswith similar properties. He discovered that the properties of elements "were periodic function of their atomic weights." This became known as the periodic law. -
Sir William Crookes
Constructed a primitive cathode ray tube, which later became basis for tv. -
Wilhelm Roentgen
Chielfly associated with his discoveries of x-rays. The first x-ray picture he made of his wifes hand is called "Rontgenogram." -
Henri Becquerel
Studdied the effects of x-rays on photographic philm. He discovered some chemicals spontaneously decompose and give off penetrating rays. -
J.J. Thomson
He described atoms as a ball as positive charge containing a number of electrons, discovered the electrons. -
Madame Curie
Radio active particles cause atoms to break down, releasing radiation that takes the form of energy and subatomic particles. Coined the term radioactivity. -
Max Planck
He developed the Quantum theory. -
Albert Einstein
Creates special and general theorys of relativity, and hypothesizes about the nature of light. This was basis of nuclear energy. -
Robert Andrews Milikan
worked on an oil drop experiment which was used to measure the charge on an electron. We are able to measure the charge of a single electron because of his experiment. -
Niels Bohr
Neobel prize in 1922- designed the Bohr planetary model- picture of atomic structure. Proposesd that the atom is "succesive orbital shells of electrons." -
H.G.J. Moesley
discovered that the number of protons in an element determines its atomic number -
Louis deBroglie
Discovered that electrons had a dual nature similar to both particles and waves. -
Werener Heisenberg
Quantum mechanical model where electrons are in probability zones called orbitas. -
Ernest Rutherford
He is the father of nuclear physics. He determined that the nucleus of an atom is very dense and has a positive charge. -
Schroedinger
He proposed the "Electron cloud theory." He identified the electron cloud as the propable location of mobing particle. -
James Chadwick
He proved the existance of newtron. He discovered a particle within the nucleus that has a mass similar to that of a proton. -
Otto Hahn
thought of as the father of nuclear chemistry, discovers nuclear fission. -
Lisa Meitner
discovered nuclear fission with Otto Hahn -
Glenn Seaborg
Descovered 8 transuranium elements. -
Enrico Fermi
He conducted the first chain reaction releasing energy from the atoms nucleus. -
Gell-Mann
proposes the quark model which describes elementary particles that have no substurctue. -
George Zweig
Won the Nobel peace prize for the discoveries concerning the classification of elementary particles and their interactions. He is still alive today.