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This chemistry video tutorial answers the question - what are isotopes? Isotopes are substances that are composed of the same element but consist of different mass numbers and number of neutrons. They share the same atomic number and therefore the same number of protons. This video contains plenty of examples and practice problems associated with isotopes and writing the atomic symbol for it.

Protons & Neutrons - Free Formula Sheet:


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Chemistry - Basic Introduction:


Significant Figures Review:


Unit Conversion Problems:


Pure Substances & Mixtures:


Physical and Chemical Changes:


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Atoms - Basic Introduction:


Cations and Anions Explained:


Diatomic Elements & Molecules:


Elements, Atoms, & Molecules:


Protons, Neutrons, & Electrons:


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Average Atomic Mass:


What Are Isotopes?


Percent Abundance of Isotopes:


Ionic and Covalent Bonding:


Naming Molecular Compounds:


Writing Formulas - Ionic Compounds:


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Final Exams and Video Playlists:


Full-Length Videos and Worksheets:

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