Problem: An atom of oxygen has an atomic number of 8 and a mass number of 18. How many of each type of subatomic particle does it contain?

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We’re being asked to determine the number of protons, electrons, and neutrons in oxygen, O-18


Recall that the symbol for an element or ion is as follows:



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An atom of oxygen has an atomic number of 8 and a mass number of 18. How many of each type of subatomic particle does it contain?