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ATOMIC STRUCTURE

ATOMIC STRUCTURE - Atomic Bonding Chapter 2 Matter is...

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Atomic Bonding Chapter 2
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Matter is composed of Elements 92 naturally occurring Atomic Number # of protons Mass Number # of protons + # of neutrons Atomic Weight Average Grams/mole
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Mole # of atoms in 12 grams of Carbon-12 Avogadro’s Number 6.022*10^23 lb mole used in English calculations # of atoms in 12 lb m of Carbon-12 What kind of calculations can you do using the definition of a mole?
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Bohr Model of the Atom Both Bohr and Schrodinger knew that matter can be thought of as either a particle or a wave Bohr chose to think of electrons as particles with wave characteristics This approach is usually more intuitively easy to understand
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Quantum Mechanics What the Bohr model can’t explain is that only certain energy states are possible for an electron Schrodinger thought of the electron as a wave
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Consider a slinky
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Only certain wavelengths are possible
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There are nodes that can not move
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Electrons can be thought of as standing waves Only certain energy levels are possible Wave particle duality
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We model many things using mathematics For example, the equation of a line is y=a*x + b a stands for the slope b stands for the intercept
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We model an electron as a wave, described with an equation with four variables, the quantum numbers n l m l m s
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Primary Quantum Number n
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