John Giesy uses an orbitrap ultra high resolution liquid chromatograph/mass spectrometer to identify and quantify organic chemicals in his lab at the school of biological sciences at the University of Saskatchewan March 24. The machine has a resolution between 1/100,000 and one million atomic mass units. | William DeKay photo
***FREEBIE*** Try out one of my science stations before buying. Review parts of an atom and how to find atomic mass with this easy-to-prep science activity. Students will review vocabulary, complete a modeling activity, and practice multiple choice questions.