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Period: 100 to
Development of Atomic Model
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101
Democritus's Theory
Democritus believed that all matter consisted of tiny particles that could not be divided. -
John Dalton's Theory
John Dalton believed that atoms were tiny particles that were indestructible and had no internal structure. -
J.J. Thomson Theory
J.J. Thomson disovered the electron. He also pictured electrons embedded in a sphere of positive electrical charge. -
Hantaro Nagaoka's Theory
Hantaro Nagaoka theorized that atoms had a central nucleas and that electrons move in rings. -
Ernest Rutherford's Theory
Rutherford stated that an atom has a dense positively charged nucleas. he also said electrons move randomly around it. -
Niels Bohr's Theory
Niels Bohr theorized that elctrons moved in spherical orbits at fixed distances from the nucleas. -
Louis de Broglie's Theory
De Broglie's theory states moving particles have some properties of waves. -
Erwin Schrodinger's Theory
Schrodinger develops math equations to describe the motion of electrons. -
James Chadwick's Theory
Chadwick confirmed the existence of neutrons which have no charge and also stated that atomic nuclei contain neutrons and positively charged protons.
