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350
Aristotle
According to Aristotle's opinion, "Atom is a material that can be divided continuously or every detail without any limits." -
400
Democritus
Actually it is 400 BC, Democritus thought that "atoms" are indivisible, indestructable particals moving in empty space. -
Isaac Newton
English physicist Isaac Newton proposed a mechanical universe with small solid masses in motion. -
John Dalton
John Dalton proposed an "atomic theory" with spherical solid atoms based upon measurable properties of mass. In the course of his studies on meteorology, Dalton concluded that evaporated water exists in air as an independent gas. He wondered how water and air could occupy the same space at the same time, when obviously solid bodies can't. This led him to think that every matter is made up particals. -
Michael Faraday
English scientist Faraday studied the effect of electricity on solutions, coined term "electrolysis" as a splitting of molecules with electricity, developed laws of electrolysis. -
Julius Plücker
German mathematician and physicist Plücker was the pioneer in the investigations of cathode rays that led eventually to the discovery of the electron. -
Dmitri Mendeleev
Russian scientist Mendeleev arrenged elements and He discovered that the properties of elements "were periodic functions of the their atomic weights". -
James Clerk Maxwell
Maxwell introduced the concept of the electro-magnetic field theory and making a connection between the waves in light and electromagnets. This fields are filled the void -
Sir William Crookes
British chemist and physicist Crookes discovered cathode rays had the following properties: travel in straight lines from the cathode; cause glass to fluoresce; impart a negative charge to objects they strike; are deflected by electric fields and magnets to suggest a negative charge; cause pinwheels in their path to spin indicating they have mass. -
Max Planck
German scientist Planck used the idea of quanta (discrete units of energy) to explain hot glowing matter. He also found the "Planck Constant", 6.62606957(29)×10^−34 J·s -
J. J. Thomson
British physicist Thomson studied on atoms and proposed an atomic model called "Plum Pudding Model". According to Thomson's view "the atoms of the elements consist of a number of negatively electrified corpuscles enclosed in a sphere of uniform positive electrification". -
Albert Einstein
German theoritical physicst Einstein Published the famous equation E=mc 2, which important for the relation between mass and energy. -
Henry Moseley
English physicist Moseley using x-ray tubes, determined the charges on the nuclei of most atoms. He wrote"The atomic number of an element is equal to the number of protons in the nucleus". This work was used to reorganize the periodic table based upon atomic number instead of atomic mass. -
Ernest Rutherford
New Zealand-born physicist Rutherford studied radiations emitted from uranium and thorium and named them alpha and beta. With "Gold Foil Experiment", he proved the existence of nucleus. -
Niels Bohr
Danish physicist Bohr developed an explanation of atomic structure that underlies regularities of the periodic table of elements. His atomic model had atoms built up of sucessive orbital shells of electrons. He received the Nobel Prize in Physics in 1922. -
Erwin Schrödinger
Austrian physicist Schrödinger viewed electrons as continuous clouds and introduced "wave mechanics" as a mathematical model of the atom. -
James Chadwick
English physicist Chadwick used alpha particles discovered a neutral atomic particle with a mass close to a proton. Thus was discovered the neutron, the neutral nucleon. -
Werner Heisenberg
German theoretical physicist Heisenberg described atoms by means of formula connected to the frequencies of spectral lines. Proposed Principle of Indeterminancy - you can not know both the position and velocity of a particle. He is one of the key actors of Quantum Atomic Theory.
