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Atomic Theory

Atomic Theory. By Kylee and Caitlin. Democrates- 600 B.C. All matter is made up of atoms. Aerostatale 500 BC. Matter=Atoms Learned multiple elements are an atom Matter made up of 4 elements. Early 1800s- John Dalton. 5 historical principle

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Atomic Theory

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  1. Atomic Theory By Kylee and Caitlin

  2. Democrates- 600 B.C. • All matter is made up of atoms

  3. Aerostatale 500 BC. • Matter=Atoms • Learned multiple elements are an atom • Matter made up of 4 elements

  4. Early 1800s- John Dalton • 5 historical principle • 1.All matter is composed of extremely small particles called atoms. • 2. Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.' • 3.Atoms cannot be subdivided, created or destroyed. • 4.Atoms of different elements combine in simple whole-number ratios to form chemical compounds. • 5.In chemical reactions atoms are combined separated or rearranged.

  5. 1897- J.J. Thompson • Verified the existence of positive particles. • Was the pudding and plum guy • Pudding was positive and plums were spread throughout the pudding • Cathode Ray

  6. 1914- Rutherford • Founded Nucleus with radioactive study (Gold foil experiment) • Protons in the nucleus • worked under J.J.

  7. Bohr • Electrons orbit around the nucleus • Planetary model • Protons an neutrons located in the nuecleous

  8. Chadwick • Neutrons in the nucleus :)

  9. Definitions :)Protons- positively charged elementary particle, found in nuclei Neutrons- elementary particle having no chargeElectron- Elementary particle having negative charge

  10. Definitions cont. • Electron configuration- represents the 3 dimensions to space in which a electron could be found. Described as four different quantum numbers • Orbital diagrams S,P,D,F how you write to get to your element • Atomic Mass Unit- Amu, way to measure mass of protons and neutrons

  11. Definitions cont. • Grams- way to measure how much an element weighs • Moles- Unit of measure to measure elements on the periodic table • Molecules- small particles that make up living and nonliving things

  12. Quantum Theory • Short hand way of writing out electron configuration

  13. LEQs • 1) Who discovered different parts of the atom? List all. • 2) How would you write the electron config. for titanium? • 3) Define the different units of measurement.

  14. Sample Problems • Who used the Cathode Ray? • Who came up with the basic idea of an atom? • Draw an orbital diagram of K • Which of the following is a correct set of quantum numbers for an electron in 5 F orbital? • A. N=5, L=3, Ml=+1, • B. N=5, L=2, Ml=+3

  15. Answers • J.J Thomson • Democrates • A.

  16. Helpful Websites • Dictionary.com • www.colorado.edu/physics/2000/periodic_table/atomic_mass.html • Chemistry.about.com/od/electroncicstructuri/a/quantumnumber/htm

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