What is available in the CIE IGCSE Free Course Preview:
Topic 1.5 Atomic structure and the periodic table
Notes - Atomic structure and mass spectrometer
Video - Atomic structure definitions
Video - Mass spectrometer
Video - Calculating Ar from the mass spectrometer
Video - Calculating % and relative abundance from Ar
Video - Mr from mass spectrometer
Video - Uses of mass spectrometer
Questions - Mass spectrometer
There are over 33 minutes of video material available for you and, if you answer the questions, then it will be more than 1 hours worth of material.
This free material allows you to get an idea of how the course works before signing up to the monthly subscription.