Day 55

Hi class,

The homework due Monday includes problems 4 and 5 on page 181, problems 21-25 on page 160, problems 26-28 on page 162, and problems 8-10 on page 186. For problem 21, please provide the electron configuration, the energy/orbital diagram, and the number of unpaired electrons for each element.

For problems 8 and 9, use the following information that wasn't covered in class. Generally, the valence electrons are the electrons that are not in the noble-gas core when writing the condensed configuration for the element. Exceptions: If the element is in the s or p-block, do not count electrons in the d or f block as valence electrons. If the element is in the d block, do not count electrons in the f block as valence electrons. Examples: Bromine has seven valence electrons. (You should already know this because group 17 elements have seven valence electrons.) Iridium has nine valence electrons.

The quiz will be on Wednesday.