Uploaded July 2025 | Updated September 2026, 1 week ago

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How many protons, neutrons, and electrons does this atom or ion have? Learn how to read and write isotopic symbols, identify ions, and avoid common exam mistakes with atomic and mass numbers. Also called nuclide symbols, atomic symbols, isotope notation, and atomic notation, they tell you EVERYTHING you need to know about one little atom: mass number, atomic number, charge of an atom or ion, and elemental symbol. PRACTICE PROBLEMS INCLUDED!

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Image Credits:
Periodic Table used with permission from sciencenotes.org/printable-periodic-table

0:00 Isotopic Symbols
6:56 PRACTICE PROBLEMS