ANSWER
The number of protons in an atom of N-15 is 7
Explanation:
Firstly, we need to define an isotope
Isotopes are two or more atoms that have the same atomic number and position in the periodic table but different mass numbers due to differences in the number of neutrons.
Recall that, atomic number = no of proton
Since the isotopes of nitrogen are N-14 and N-15
The atomic number of nitrogen is 7 according to its position in the periodic table
Hence, the number of protons in an atom of N-15 is 7