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101
Democritus Theory
His Theory is that it revolves around the atoms that are present in the atmosphere. These are about the atoms that are present in all the forms of existence; for instance, solid or liquid. The theory states that these atoms are all individually created and cannot be separated, no matter what scientific procedures are applied. -
101
Democritus
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John Dalton
All matter is made of atoms. Atoms are indivisible and indestructible.
All atoms of a given element are identical in mass and properties
Compounds are formed by a combination of two or more different kinds of atoms.
A chemical reaction is a rearrangement of atoms. -
john dalton
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JJ Thomson
He is credited with discovering electrons and isotopes, and inventing the mass spectrometer. Thomson was awarded the 1906 Nobel Prize in Physics for the discovery of the electron and for his work on the conduction of electricity in gases. He discoved the electrons. -
JJ Thomson
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Hantaro Nagaoka
Between 1892 and 1896, Nagaoka studied abroad in Vienna, Berlin, and Munich, where he was particularly fascinated by Ludwig Boltzmann’s course in the Kinetic Theory of Gases and Maxwell’s work on the stability of Saturn’s rings, two influences which would later lead to the development of the Saturnian model of the atom in 1904. -
Hantaro Nagaoka
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Ernest Rutherford
stated that the atom has a dence positively charged nucleus. electrons move randomly in the space around the nucleus. he aimed a narrow beam of alpha particles at the gold. it flashed so he could tell the path of the alpha particles after it passed through the gold. -
Ernest Rutherford
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Neils Bohr
Niels Bohr applies quantum theory to Rutherford's atomic structure by assuming that electrons travel in stationary orbits defined by their angular momentum. This led to the calculation of possible energy levels for these orbits and the postulation that the emission of light occurs when an electron moves into a lower energy orbit. that they move in spherical orbits at a fixed distance from the nucleus -
Niels Bohrn
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Werner Heisenberg & Erwin Schrodinger
he develops mathematical equations to describe the motion of electrons in the atoms -
Werner Heisenberg & Erwin Schrodinger
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James Chadwick
discovered the neutron in 1932, resulting in the solution of the jig-saw puzzle for the weight of atoms. His discovery formed the base for the investigation of the tougher questions of nuclear physics: the nature of the nucleus and its forces -
James Chadwick
