This consists of two parts (and a solution, which is linked below under "Related Resources", but for which you will need a faculty privileges): a primer for students (best if handed out prior to class so that students can read it beforehand, or delivered in pre-lecture format) and a worksheet. The worksheet is designed to be done in small groups with assistance from an instructor. In very large classes, in which the instructor cannot circle amongst the groups, the instructor can work through each example after the groups have a few minutes to work the problem on their own.
The idea is for the students to learn to "count to 18" by figuring out their own rules, given that the compounds are 18 (or 16) electron compounds rather than telling them the rules for various ligands.
Omitted from this worksheet are the more complex cases: compounds with metal-ligand multiple bonds and nitrosyls, since these are often handled later in the organometallics unit by many instructors and since instructors and textbooks differ in their treatment of these ligands.
Students will be able to determine dn electon counts, oxidation states, and overall electron count for most organometallic complexes.
Students will be able to explain the rationale behind the counting schemes and to articulate the pros and cons of each method.
Students will be able to identify and become familiar with a number of common ligands without time being specifically dedicated to a survey of these ligands.
Students. Implements of writing.