Atomic Model Timeline

In Glogpedia

by johnnybloom
Last updated 3 years ago

Discipline:
Science
Subject:
Chemistry
Grade:
10

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Atomic Model Timeline

Atomic Model Timeline

Alchemists - searched for the Philosopher's Stone, which had the ability to transform base materials like copper or lead, into valuable substances, like gold. They also searched for the Elixir of Life, which when drunk by a particular person, would grant him immortality.

475 B.C.

400 B.C.

Democritus, Greece - stated that all matter is made up of atoms. He also stated that atoms are eternal and invisible and so small that they can’t be divided, and they entirely fill up the space they’re in.

Aristotle, Greece - provided the method of gathering scientific facts, which proved as the basis for all scientific work. He by systemizing deductive logic and wrote on physical subjects.

350 B.C.

Lavoisier , France - provided the formula for the conservation of matter in chemical reactions, and also distinguished between an element and a compound.

1777

John Dalton (1803), England - formed the atomic theory, which states that all matter is composed of tiny, indestructible particles called atoms that are all alike and have the same atomic weight.

1803

W.K. Roentgen , Germany - discovered x-rays while experimenting with cathode-ray tubes.

1895

Becquerel, France - discovered radioactivity when he investigated uranium and other radioactive substances.s.

1896

J.J Thomson England - discovered the electron and developed the plum-pudding model of the atom.

1898

1909

Johnny Bloom

Albert Einstein, Germany - postulated that light was made up of different particles that, in addition to wavelike behavior, demonstrate certain properties unique to particles. He also brought forth the theory of relativity.

1905

Robert Millika USA - found out the electric charge of the electron

1908

Ernest Rutherford , England - used the results of his gold-foil experiment to state that all the mass of an atom were in a small positively-charged ball at the center of the atom.

Neils Bohr , Denmark - stated that the electrons moved around the nucleus in successively large orbits. He also presented the Bohr atomic model which stated that atoms absorb or emit radiation only when the electrons abruptly jump between allowed, or stationary, states

1913

Otto Hahn, Germany - discovered nuclear fission, in which the nucleus of an atom breaks up into two separate nuclei, while experimenting with uranium

1938

Indivisible Solid Sphere Model (Dalton)

Electron Cloud Model (Bohr)

Solar Sytem Model

Plum Pudding Model (Thomson)

Nuclear Model (Rutherford)


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