1 / 19

Atomic Theory

Atomic Theory. How to take notes today :. For each scientist: Write the green items in Dates Write the blue and red in Theory and Facts Draw a pic of there model You only need to write the colored information. First Concept of an Atom. John Dalton 1766-1844.

jaunie
Download Presentation

Atomic Theory

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Atomic Theory

  2. How to take notes today: • For each scientist: • Write the green items in Dates • Write the blue and red in Theoryand Facts • Draw a pic of there model • You only need to write the colored information.

  3. First Concept of an Atom

  4. John Dalton1766-1844 • Introduced his ideas in 1803 • Each element is composed of extremely small particles called atoms • All the atoms of a given element are identical, but they differ from those of any other element • Atoms are neither created nor destroyedin any chemical reaction • A given compound always has the same relative numbers and kinds of atoms

  5. Dalton’s Model

  6. J.J. Thompson 1856-1940 • Discovered electron 1897 – Cathode Ray Experiment • Plum Pudding model 1904 • Electrons discovered in a soup of positive charges • Discovered isotopes 1913

  7. JJ Thompson’s Ideas

  8. Cathode Ray Tube Experiment

  9. Plum Pudding Model

  10. Ernest Rutherford1871-1937 • Nucleus Theory 1910 • alpha particle gold foil experiment • An atom’s mass is mostly in the nucleus • The nucleus has a positive charge (Moseley) • Electrons in fixed orbit

  11. Gold Foil Experiment

  12. Rutherford Model

  13. Niels Bohr1885-1962 • Planetary Model 1913 • Nucleus surrounded by orbiting electrons at different energy levels • Electrons have definite orbits • Utilized Planck’s Quantum Energy theory • Worked on the Manhattan Project (US atomic bomb)

  14. Bohr’s Model

  15. Bohr Model for Nitrogen

  16. Ernst Schrödinger 1887-1961 Werner Heisenberg 1901-1976 • Quantum Mechanical Model 1926 • Electrons are in probability zones called “orbitals”, not orbits and the location cannot be pinpointed • Electrons are particles and waves at the same time • Developed quantum numbers based on theories of Einstein and Planck

  17. Orbital model

  18. Quantum Mechanical TheoryElectron in a Hydrogen atom

More Related