Mr. Andersen describes the major groups on the periodic table.

Introduction to photoelectron spectroscopy

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.

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)

Practice some electron configuration problems that you may possibly see on your next quiz or exam! In this video, you'll practice 3 different electron configuration examples and I'll explain the answers step by step.

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.