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Readings
Reading the following sections for chapter Chapter 5:
Videos
How to Write Electron Configurations and Orbital Diagrams
Writing electron configuration for different elements is quite simple with the use of a periodic table. Simply split the periodic table into s,p,d and f blocks and use the period # to determine the energy level (d 1 behind, f 2 behind)
Electron Configuration with Ions
Using electron configurations to demonstrate and explain the formation of ions.
Valence and the Periodic Table
Where do electrons live in atoms? They live in energy levels or shells, which are varying distances from the nucleus, and can hold varying numbers of electrons. The most important electrons in an atom are the valence electrons, which are in the outermost energy level or shell. We'll look at how to determine the number of valence electrons in an atom, based on which column it is in on the periodic table.
Confused about ions? We'll learn the difference between an atom and an ion. Ions are formed because of a net charge on an atom, because the number of protons and electrons do not balance. This means that the atom is no longer electrically neutral, but is a cation or an anion. We also talk about polyatomic ions.
Introduction to Photoelectron Spectroscopy
Introduction to photoelectron spectroscopy
Paramagnetic vs Diamagnetic - Paired vs Unpaired electrons - Electron Configuration
This chemistry video tutorial focuses on paramagnetism and diamagnetism. It shows you how to identify if an element is paramagnetic or diamagnetic by writing the ground state electron configuration using noble gas notation and determining if the element has unpaired electrons by drawing the orbital diagram. Elements with unpaired electrons are paramagnetic which are weakly attracted to an external magnetic field. Elements with paired electrons only are diamagnetic and are weakly repelled by an external magnetic field.
Practice Problems
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