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Card 12 / 27:
Oxygen, whose atomic number is eight, has three stable isotopes: 16 O, 17 O, and 18 O. Explain what this means in terms of the number of protons and neutrons.
Oxygen has eight protons. In its most abundant stable form, it has eight neutrons, too, for a mass number of 16. In contrast, 17 O has nine neutrons, and 18 O has 10 neutrons.
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