average atomic mass

M&M’s (Mars, Inc.) come in a number of colors and sizes. I have found them to be a good visual and kinesthetic model for examining the concept of isotopes and average atomic mass. I use Mega M&Ms, M&Ms minis, and regular M&M’s in this activity. All of these can be purchased in the candy or baking aisles of your local big box store.

The first unit of chemistry, no matter your content sequence, is an opportunity to use formative assessments to identify student prior knowledge. In addition, this is also a time for your students to get an idea of your instructional approach and how they will be participating in class.