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Lecture 3

CHEM 1A03 LECTURE 3 SEPTEMBER 18 - ELECTRONS IN ATOMS.docx

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Department
Chemistry
Course
CHEM 1AA3
Professor
David Brock
Semester
Spring

Description
CHEM 1A03 LECTURE 4 – CHAPTER 8: ELECTRONS INATOMS September 18 2012 What do we understand about atoms? • Mostly space • Dense nucleus, surrounded by negatively charged electrons in shells and sublevels o Electrons are defined by quantum mechanics, not traditional mechanics o Electrons behave like particles AND waves (wave-particle duality o Their movements have associated changes in energy o Not at fixed distances in fixed locations o Orbitals describe regions in space where electrons are likely to be found o Quantum numbers describe and define orbitals • Valence shell is where most chemistry occurs • Location and speed of electrons cannot be determined simultaneously • Each atom has an electron configuration • Electron shells have unique energy levels • Energy between orbitals is quantized Electromagnetic Spectrum 1 c = vλ E α v E α λ Ozone and UV Exposure O3 O 2 O + Heat ~ozone photolysis~ • 90% of UVB radiation from the sun is selectively absorbed by photolysis of O3in the stratosphere • h v 280-320nm
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