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27 February, 10:01

How many neutronss are in an atom of oxygen with a mass number of 18?

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  1. 27 February, 11:47
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    10. Mass number = Atomic number + number of neutrons. The atomic number of oxygen is 8. Hence 18 = 8 + number of neutrons. Rearranging, number of neutrons = 18 - 8 = 10
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