Atomic Theory
by
Latehighlighter
Last updated 5 years ago
Discipline:
Science Subject:
Physics


Atomic Theory
TIMELINE of the DEVELOPEMENT of the ATOMIC THEORY
442 BC
Thinking about atoms
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Pierre and Marie Curie theorized that radioactive particles cause atoms to break down, then releasing radiation that takes the form of energy and subatomic particles.
James Chadwick discovers the neutron component of the atomic nucleus, explaining the nuclear fission of uranium 235.
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1803
John Dalton Atoms
1898
Radiation, energy, and the atom electrons found
1909
1931
Structure of an atom developed
Neutron is discovered
Democritus, a Greek philosopher, co-originated the thought that all matter is composed of indivisible elements.
John Dalton developed a theory that matter is simply composed of atoms of different weights and
Ernest Rutherford known as the father of nuclear physics, developed the theory for the
structure of the atom. He used a gold foil experiment, observing the scattering of alpha
particles, and demonstrated for the first time the existence of the atomic nucleus.
JJ Thomson discovers the electron, using properties of cathode rays
is combined in ratios by weight. Proposed that these atoms are also spherical, and are in motion.
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