CH101 Lec3

CH101 Lec3 - Chapter 3- Atomic Structure and Properties...

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Chapter 3- Atomic Structure and Properties Section 3.1 There are two classes of electrons in an atom: Core - In low energy filled shells, tightly bound Valence - In highest energy orbitals, more loosely bound
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1 s 2 s 2 p 3 s 3 p 4 s 3 d 4 p sublevels E/r Atomic Orbital Energy Level Diagram Outermost shell-highest E electrons = most reactive! What atom is this?
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Valence electrons General rules s-block: highest energy s electrons Na 3s 1 Ca 4s 2 d-block: highest energy s and d electrons Noble gases have all core electrons
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Section 3.3 Periodicity and Predicting Atomic Properties: Atomic Radii Ionization Energy Electronegativity Periodic trends governed by the attraction between the nucleus and electrons.
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Valence electrons are shielded from the nuclear charge by intervening electrons, mainly core electrons. Nuclear charge experienced by valence electrons is called the effective nuclear charge, Z eff Effective Nuclear Charge
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Rules for shielding: Core electrons are very good at shielding valence
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This note was uploaded on 03/29/2008 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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CH101 Lec3 - Chapter 3- Atomic Structure and Properties...

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