Lecture #17, Monday, November 2nd

Class tarted today with discussing Chapter 7, which is the Periodic Properties of the Elements. We talked about the tabular arrangement of the elements in the periodic table and the horizontal periods and vertical groups. We separate the elements of the periodic table into two generic groups called the "main group" and "transition metals." We do this due to the different properties of these groups, particularly that the transition metals do not necessarily always have a noble gas electron configuration upon forming ions. We also observe that transition metal ions will lose their s electrons first, then their d electrons when forming an ion.

We then discussed periodic trends starting with metallic character. I then talked about effective nuclear charge, and used that concept to explain the trends in atomic and ionic radii.

On Wed I will talk about ionization energy, electron affinity, electronegativity, and various other periodic trends.