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2.1.5 Protons/neutrons/electrons in atoms/ions from mass/atomic number and charge IB Chemistry SL

For atoms the atomic number (smaller of the two numbers) is the number of protons which equals the number of electrons. The larger number is the mass number, which is the number of protons and neutrons in an atom or ion. The difference in atomic number and mass number is the number of neutrons. Ions have a charge -- a positive charge means electrons have been lost and vice versa. Do NOT eat ectoplasm -- normally it was hidden somewhere unpleasant before it was produced ...
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