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Discovery of the Atom

Discovery of the Atom. Born in Abdera about 460 B.C. Proposed that all matter is composed of atoms. Democritus. Antoine Lavoisier (1743-1794). Established the Law of Conservation of Mass which stated that matter could neither be created or destroyed. John Dalton (1776-1844).

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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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