Atomic Emission Spectra and Quantum mechanical Model

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Presentation transcript:

Atomic Emission Spectra and Quantum mechanical Model

Waves

Low Frequency and High Frequency waves Frequency is cycles per second

Electromagnetic Spectrum

Atomic Emission Spectra Pattern formed when light passes through a prism or diffraction grating to separate it into different frequencies of light it contains Atomic emission spectra is caused by atoms absorbing energy and the electrons move to the higher energy level. When the energy goes back down to their lower energy level, it emits a light

Ground State/Excited State Ground state: electrons at its lowest energy possible Example: Sodium’s outer electron is in the s orbital Excited state: electrons going to its higher energy Example: Sodium outer electron going to the s orbital to p (p orbital is higher energy than s)

How are frequencies of light emitted by an atom in relation to changes of electron energy? The electrons are moving from a higher energy to a lower (excited state to ground state) http://www.youtube.com/watch?v=8M72pX5wlyE

Classical vs. Quantum Mechanics Classical mechanics deals with larger objects (humans, cars, baseball, marbles In quantum mechanics, matter moves like waves and it pertains to much smaller matter, such as light particles, atoms

Heisenberg Uncertainty Principle It is impossible to know both the location and the speed of an electron at the same time

Famous scientist in quantum Max Planck: energy changes in small units known as quanta (Energy= Planck’s constant x frequency) E=hv Planck’s constant is 6.626 x 10-34 Js Albert Einstein: used Planck’s theory to explain the photoelectric effect Photoelectric effect: light can be described as quanta and behaves like particles Louis de Broglie: explains that all matter moves like waves