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Nitrogen is the 7th element on the periodic table. One isotope of nitrogen has atomic mass 15. In a neutral nitrogen-15 atom there are _____ protons, _____ neutrons, and ______ electrons. I don't just need the answer but just an explanation of how you got that.This should be really simple.n a neutral atom, number of electrons = number of protons Therefore number of electrons = 7 Number of protons + number of neutrons = atomic mass Or number of neutrons = atomic mass-number of protons = 15 - 7 = 8 Ans: 7 protons, 8 neutrons, and 7 electrons ____________________.
Number of neutrons. However, not all nitrogen nuclei have 8 neutrons in a nucleus. They can have 5, 6, 7, 8, 9, 10 or 11 neutrons. We call these different isotopes of nitrogen. There are always 7 protons because the nucleus is always a nitrogen nucleus (Z=7).Since different isotopes of an element have different numbers of neutrons (but always the same number of protons) they have different mass numbers. The isotopes of nitrogen have mass numbers ranging from 12 to 18.We call them nitrogen-12, nitrogen-13, nitrogen-14 and so on. Some isotopes of nitrogen are unstable.here are always 7 protons because the nucleus is always a nitrogen nucleus (Z=7). Since different isotopes of an element have different numbers of neutrons (but always the same number of protons) they have different mass numbers.