A nitrogen atom has a charge of 3- and a mass number of 15. Is this the most common isotope of nitrogen? How many electrons does this atom have?

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No, it is not the most common isotope of nitrogen.  The most common isotope would have a mass number of 14.  If you look at the periodic table of elements, nitrogen is element number 7.  That means it has 7 protons.  To get the mass number, you need to add together the number of protons and neutrons in the atom.  The number of neutrons can differ from atom to...

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