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Discovery of the Atom

Explore the historical journey of atomic discovery from Democritus and Dalton to Bohr and Rutherford's groundbreaking theories, leading to the Modern Atomic Theory and the Quantum Atom. Learn about the Law of Conservation of Mass, Dalton's Atomic Theory, Bohr Atom, and Rutherford's Model.

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Discovery of the Atom

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  1. Discovery of the Atom

  2. Born in Abdera about 460 B.C. Proposed that all matter is composed of atoms Democritus

  3. Antoine Lavoisier (1743-1794) • Established the Law of • Conservation of Mass which stated • that matter could neither be created or destroyed

  4. John Dalton (1776-1844) British chemist and physicist who developed the atomic theory of matter.

  5. Dalton’s Atomic Theory • Elements are composed of particles called atoms. • Atoms of a given element are identical, but differ from those of any other element. • Atoms are neither created or destroyed. • A given compound always has the same relative numbers and kinds of atoms.

  6. Niels Bohr (1885-1962) Proposed a planetary model of the atom saying that electrons exist in distinct orbits.

  7. The Bohr Atom

  8. J.J. Thomson (1856-1940) Used cathode ray tubes to discover the electron.

  9. Robert A. Millikan (1868-1953) His earliest major success was the determination of the charge and mass of a single electron.

  10. Ernest Rutherford (1871-1937) Determined that all of an atom’s positive charge as well as most of it’s mass was concentrated in a small core which he called the nucleus. .

  11. Rutherford’s Model

  12. Modern Atomic Theory The Quantum Atom

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