4-Chapter_02--Atomic Bonding

# 4-Chapter_02--Atomic Bonding - CHAPTER 2 BONDING AND...

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Chapter 2- ISSUES TO ADDRESS. .. What promotes bonding? What types of bonds are there? What properties are inferred from bonding? 1 CHAPTER 2 BONDING AND PROPERTIES

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Chapter 2- ATOM Democritus (B.C.500) Rutherford Model (1900) - electrons revolving around a nucleaus so that the electrostatic attraction is balenced by centrifugal force. But if so, change in angular momentum must cause energy loss in the form radiation causing the electron to spiral and fall over the nucleus. Max Planck (1900)- predicted the particle (quanta) nature of radiation. An idea supported by Einstein. Quantum Mechanics. Bohr Model (1913)- descrete orbits which magically emit no radiation when in an orbit such that mv=nh/2 π , h=Planck’s constant=6.6x10 -3 J*s, n=integer. De Broglie- predicted the dual nature of matter, i.e., matter behaves as a wave as well as a particle. Schrodinger-Heisenberg- Wave nature of electrons introduced to Bohr model through a differential wave equation and matrix algebra. Wave function of Schrodinger Eq’n represents the probability of an electron Heisenberg’s Uncertainity Principle- x m=h Electron spin and Pauli exclusion principle introduced to give the modern atomic model so that electron motion can only be specified by four numbers, n,l,m,n, which are known as the qunatum numbers obtained from the solution of Schrödinger equation .
Chapter 2- Nucleus: Z = # protons 2 orbital electrons: n = principal quantum number n=3 2 1 = 1 for hydrogen to 94 for plutonium N = # neutrons Atomic mass A Z + N BOHR ATOM

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4-Chapter_02--Atomic Bonding - CHAPTER 2 BONDING AND...

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