If the atomic number of nitrogen is 7 and a mass number of 14, it means that nitrogen atoms have 7 neutrons.
The mass number is the number of protons and neutrons in the atom of an element.
For every element, the atomic number represents the number of protons and for neutral atoms, the sum of protons and neutrons gives the mass number.
Thus, for atomic number 7 and mass number 14, it means that the number of neutrons would be: 14 - 7 = 7.
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