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13 February, 15:57

An ion contains 8 protons, 10 electrons, and 7 neutrons. What is the mass of the ion?

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  1. 13 February, 17:37
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    Answer: 15

    Explanation:

    The mass of the ion is the sum of the protons and neutrons inside its nucleus.

    i. e Mass number = protons + neutrons

    Mass number = 8 protons + 7 neutrons

    = 15

    Furthermore, since the number of protons differ from the number of electrons by 2, the ion was formed when its atom gained 2 electrons. Thus, it is a negatively charged ion (anion) with a mass of 15
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