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Chemistry
Elements and Compounds
Atoms and Atomic Structure

The nucleus of nitrogen atom contains 7 neutrons and 7 protons what is the mass number?

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September 23, 2009 8:03PM

Mass Number is the number of protons or electrons in the element. Nitrogen has a mass number of 7, an atomic mass of 14 and a valence orf 5 (meaning it needs 3 more electrons to become stable).