CH3 [Compatibility Mode]

CH3 [Compatibility Mode] - Chapter 3- Atomic Structure and...

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1 Chapter 3- Atomic Structure and Properties There are two classes of electrons in an atom: Core - In low energy filled shells tightly bound In low energy filled shells, tightly bound Valence - In highest energy orbitals, more loosely bound Suggested Ch3 practice problems: 1, 7, 9, 11, 13 4s 3 d 4 p sublevels E/r Atomic Orbital Energy Level Diagram 1 s 2 s 2 p 3 s 3 p Outermost shell-highest E electrons = most reactive and most important in bonding! What atom is this? Valence electrons General rules s-block: highest energy s electrons Na 3s 1 Ca 4s 2 d-block: highest energy s and d electrons V 4s 2 3d 3 Cu 4s 1 3d 10 p-block: highest energy s and p electrons P 3s 2 3p 3 Ga 4s 2 4p 1 Noble gases have all core electrons What is the VALENCE configuration of nickel (Ni)? 1. 4s 2 3d 8 2. 4s 2 4d 8 3 3d 8 1234 0% 0% 0% 0% 3. 4. [Ar] 4s 2 3d 8 10
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2 What is the VALENCE electron configuration for lead (Pb)? 1. 6s 2 4f 14 6p 2 2. 6s 2 4f 14 5d 10 6p 2 1234 0% 0% 0% 0% 10 3. 6s 2 5p 2 4. 6s 2 6p 2 Periodicity and Predicting Atomic Properties: Atomic Radii Ionization Energy Electronegativity Section 3.3 Periodic trends governed by the attraction between the nucleus and electrons. Valence electrons are shielded from the nuclear charge by intervening electrons, mainly core electrons Effective Nuclear Charge electrons. Nuclear charge experienced by valence electrons is called the effective nuclear charge, Z eff Rules for shielding: • Core electrons are very good at shielding valence electrons from the nucleus. • Electrons in the same valence shell provide moderate shielding.
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This note was uploaded on 09/17/2009 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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CH3 [Compatibility Mode] - Chapter 3- Atomic Structure and...

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