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Unformatted text preview: Ch6A Fall07 Pomeroy TA: Candace Seu Final Review: Ch 1 1 Chapter 1: Quantum Mechanics and Periodic Table Trends 1. Energy in the form of light Two equations: c=λν E=hc/ν E=hν Think!: • λ and ν are inversely proportional • The speed of light is always c=2.998 x 10 8 m/s (independent of λ and ν) 2. Atoms: made of interacting electrons and nuclei Recall: g = G¡ ¢ ¡ £ ¤ £ for the interaction of two charges Two cases: 1. q 1 = ○ + , q 2 = ○- E is attractive, stabilizing 2. q 1 = ○ + , q 2 = ○ + E is repulsive, destabilizing What is an atom? Positively charged nucleus, negatively charged electrons Nuc and e- attract e- and e- repulse determine energy/location of electron Think!: • By convention, negative energies are favorable. • Electrons held closer to the nucleus (lower n and m quantum numbers) are lower energy. Summary: Atoms are made of nuc and e-, which interact. If net interactions -> stable, things will stay as is. If unstable, will change and react. Therefore, we want to figure out how the electrons are behaving (interacting)!...
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- Winter '08
- Periodic Table, Periodic Table Trends, HUP A. Electron, Candace Seu