what will be the number of neutrons if an atom has mass number = 23 and the number of electrons = 11?
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The mass number of an element tells us the number of protons AND neutrons in an atom (the two particles that have a measurable mass). Sodium has a mass number of 23amu. Since sodium has 11 protons, the number of neutrons must be 23 – 11 = 12 neutrons.
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Since sodium has 11 protons, the number of neutrons must be 23 – 11 = 12 neutrons.
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