A Brief History of the Atom Part 2 PDF
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This document provides a summary of key scientists and concepts related to atomic theory. It goes over the details of the atomic spectrum, orbits, and the quantum mechanical model of the atom with details of various scientists' contributions. The information is presented in a format likely used in a high school science course.
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A Brief History of the Atom Part II SOL style! This is a continuation of the brief summary of the atom based upon the SOL scientists that you need to know. It is by no means comprehensive, and is not in a chronological order. It is simply meant as a study guide to those scientists covered by the...
A Brief History of the Atom Part II SOL style! This is a continuation of the brief summary of the atom based upon the SOL scientists that you need to know. It is by no means comprehensive, and is not in a chronological order. It is simply meant as a study guide to those scientists covered by the SOL standards A. **Neils Bohr** a. Studied the **atomic spectrum** of Hydrogen and the electrons extensively. https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRc9f0hrFF0dAYi2LZRrjc6nd8i9J85Febkj3QWJbECCyt-2EEF i. Noticed that electrons only seemed to exist at specific wavelengths or energy levels ii. Postulated that electrons could only exist in certain **orbits** iii. The number of electrons per orbit was equal to the number of elements in a given period 1. Period 1 = 2 max electrons 2. Period 2 = 8 max electrons 3. Period 3 = 8 max electrons 4. Period 4 = 18 max electrons 5. Period 5 = 18 max electrons 6. Period 6 = 32 max electrons 7. Period 7 = 32 max electrons b. Created the **Orbital or Planetary Model** of the atom  B. **Max Planck** c. Came up with the idea that energy consisted of **quanta** or discrete units or packets of matter. iv. This idea supported some of Bohr's ideas in that it showed electrons might only be able to exist at certain points or levels (orbits) C. **Werner Heisenburg** d. Came up with the **Heisenburg Uncertainty Principle** v. Only the position OR the speed of an electron can be gained at one time because the act of observing will change one or the other. vi. Assisted in the formation of the Quantum Model of the atom D. **Louis De Broglie** e. Gave us the **Dual Nature of Light** vii. Light exists as both a particle AND wave, so is in fact both energy and a particle. viii. Assisted in the formation of the Quantum Model of the atom E. **Earnest Schrodinger** f. Gave us the **Quantum or Wave Model** of the atom. ix. Electrons occupy regions rather than orbitals around a nucleus x. Calculates the PROBABILITY that an electron can be found in that area, not a certainty http://3219a2.medialib.glogster.com/media/80/80de24bfd524627f56060eeeabe492725b9001cd432c7e198694a2f89b77d079/quantum-theory-of-model-atom.jpg Dots represent electron density, or where the electrons are MOST likely to be found Notice the highest concentration exists closest to the nucleus F. **Robert Millikan** g. Performed the **Oil Drop Experiment**: xi. Used X-rays to induce (create) a charge on oil drops xii. Used charge plates to suspend (levitate) the drops xiii. Occurred in specific units, which allowed him to discover the **charge on an electron**. 
