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Because the world is made up like this.

Well, a 18O, as it's name shows, has a releatve mass of 18 units. A proton has got a mass of 1 ,a neutron ahd got a mass of 1, and electron has gor a amss of 1/1840 (we dont calculate with a this small mass). So in a 18 relative mass, neutrons + protons = 18. As oxygen is the 8th in the Periodic Table, it has got 8 atoms. So neutrons + 8 = 18, where neutrons = 10.

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15y ago

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