CHEM 6A Lecture Number 2

CHEM 6A Lecture Number 2 - * Electromagnetic Radiation a...

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Group 1 : Alkali Metals 2 : Alkaline Earth Metals 16 : Chalcogens: mineral-formers 17 : Halogens: salt-formers 18 : Noble Gases Inner Transition Metals : #’s 58-71 : Rare Earth Lanthanides #’s 90-103 : Actinides (most isotopes are radioactive) General Trend : Vertically down period table = More Metallic Horizontally across table = Less Metallic Therefore MOST METALLIC: Fr (Francium) Metals : Left of Staircase Metalloids : Touching staircase Nonmetals : Right of staircase Experimenter : J.J. Thomson Experiment : Cathode Rays Discovery : Electron, e - ~ m/e = ratio Once taken apart, electron acted as a particle. Experimenter : Rutherford Experiment : Gold Foil Experiment Conclusion : Planetary Model (dense nucleus, atom ~ pretty empty) Observing Atoms : * Spectroscopy – the analysis of the light emitted or absorbed by substances Atoms ~ Line spectrum Hot Source ~ Continuous Spectrum
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Unformatted text preview: * Electromagnetic Radiation a wave of electric and magnetic fields All move t c = 3 x 10 8 m/s (speed of light) Wavelength = c = = m/s = wavelength = frequency (sec-1 , Hz) **R O Y G B I V** (Colors) Red ~ Long therefore, small frequency Violet ~ Short therefore, high frequency State of Science in 1900 Light and other radiation described by Maxwells equation Experimenter : Planck Studied : Black Body Radiation ~ UV Catastrophe (Threshold Frequency) Conclusion : Certain frequencies Harmonic Oscillators Coined Term: Quanta ; Energy is quantized ; Matter and Energy are NOT continuous E = hv h = Plancks constant = 6.6260693 x 10-34 J s Experimenter : Einstein Experiment : Photoelectric Effect Conclusion : Coined Photon E = hv Wave Particle Duality...
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This note was uploaded on 12/03/2009 for the course CHEM 6A taught by Professor Pomeroy during the Fall '08 term at UCSD.

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CHEM 6A Lecture Number 2 - * Electromagnetic Radiation a...

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