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This certain isotope of oxygen would have a mass of about 18 because electrons weigh almost nothing.

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11y ago

Atomic number of an element is always equal to the number of protons, irrespective of the number of neutrons.

Since oxygen has 8 protons, its atomic number is 8.

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Q: If an isotope of oxygen has 8 protons 10 neutrons and 8 electrons its mass number is?
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