Mission CM9 Counting Atoms

Mission CM9 assesses students’ ability to count the number of atoms of an element in a formula. The mission consists of 32 questions organized into 8 Question Groups.

• The student should be able to count the number of atoms of each element represented in a formula or a set of formulae with or without coefficients.

If you are not familiar with this topic, then you should first learn about the topic using our written Tutorial:

• Words, Symbols, and Particle Diagrams