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28 October, 12:24

An atom of sodium has 11 protons, 11 electrons, and 12 neutrons, what is its atomic number and mass number?

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  1. 28 October, 13:27
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    Example: A sodium atom contains 11 protons, so its atomic number is 11. Mass number is the total of the protons and neutrons together, and it is given the symbol A. Example: A sodium atom contains 11 protons and 12 neutrons; its mass number A is 23.
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