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History of the Atom Model

Who was the first person to introduce the concept of atoms?

Democritus

Who thought that atoms were made of wind, fire, water and earth?

Aristotle

Who introduced the concept that atoms cannot be created or destroyed?

John Dalton

Who thought that atoms were arranged like billiard balls?

John Dalton

Who introduced the concept that all atoms must contain negative particles?

J.J. Thomson

Who said that negative charges in atoms are balanced by a positive spherical cloud?

J.J. Thomson

Who proved the existence of the atomic nucleus?

Ernest Rutherford

Who did the gold leaf experiment?

Ernest Rutherford

Who introduced the concept of electrons orbiting the nucleus?

Bohr

Who said that only certain electron orbits are allowed in certain shells?

Bohr

Who said each electron orbit has a specific energy?

Bohr

Who introduced the uncertatinty principle? (e;ectrons behaving in waves)

Heisenberg & Shrodinger

Who's theories about the atom gave rise to quantum theory?

Heisenberg & Shrodinger

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