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There are 8 neutrons in oxygen.

You can determine the number of neutrons in any element by subtracting the atomic number (which is 8 for oxygen) from the Atomic Mass, rounded to the nearest whole number (which is 16 for oxygen). This is because the mass of any element comes mainly from the protons and the neutrons - the mass of the electrons is too tiny to be a significant contribution. The atomic number corresponds to the number of protons in an element, so when you subtract it from the element's total mass, you are left with the number of neutrons.

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15y ago

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