What is the difference in the composition of the nucleus of nitrogen isotopes 14 7N and 15 7N

The number of neutrons. The 14 7N isotope contains 7 neutrons, the 15 7N isotope 8 neutrons.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.