Atomic Timeline

Ellie Burch

1803- John Dalton Model of the Atom

John Dalton sees atoms as tiny, indestructible particles, with no internal structure.
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1897- J.J. Thomson Model of the Atom

J.J. Thomson was a British Scientist who discovered the electron, leading to his "plum-puddling" model. He pictures electrons embedded in a sphere of positive electric charge.
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1904- Hantaro Nagaoka Model of the Atom

Hantaro Nagaoka was a Japanese physicist who suggested that an atom has a central nucleus. Electrons move in orbits like the rings around Saturn.
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1911- Ernest Rutherford Model of the Atom

Ernest Rutherford states that an atom has a dense, positively charged nucleus. Electrons move randomly in the space around the nucleus.
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1913- Neils Bohr Model of the Atom

In Neil Bohr's model, the electrons move in spherical orbits at fixed distances from the nucleus.
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1924- Louis de Broglie Model of the Atom

Louis de Broglie proposes that moving particles like electrons have some properties of waves. Evidence is collected to support this idea.
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1926- Erwin Shrodinger- Electron Cloud Model of the Atom

Erwin created mathematical equations to describe the motion of electrons in atoms.
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1932- James Chadwick Model of the Atom

He was a British physicist. He confirms the existence of neutrons, which have no charge. Atomic nuclei contain neutrons and positively charged protons.
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