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10 September, 23:43

If an atom has 12 protons, 13 neutrons, and 10 electrons, what is its mass number?

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  1. 10 September, 23:46
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    25. Electrons are so small that they don't add, much if any, to the mass number. So you just add the protons and neutrons to get the rough estimate of the mass number.
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