Keep going! Watch the following lesson and practice what you learn:
https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:atomic-structure-and-properties/x2eef969c74e0d802:mass-spectrometry-of-elements/a/isotopes-and-mass-spectrometry

In the analytical technique of mass spectrometry, atoms or molecules are ionized using a high-energy electron beam and then separated based on their mass-to-charge ratio (m/z). The results are presented as a mass spectrum, showing the relative abundances of the ions on the y-axis and their m/z ratios on the x-axis. This data can be used to calculate the exact mass of the atoms or molecules in the sample. View more lessons or practice this topic at https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:atomic-structure-and-properties/x2eef969c74e0d802:mass-spectrometry-of-elements/v/mass- spectrometry

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