Which of the following correctly compares the phosphorus isotopes 31p and 32p

The statement that correctly compares the phosphorus isotopes 31p and 32p is 31 p has 16 neutrons whereas 32 p has 17 neutrons.  isotopes are atoms of the same element that have the same atomic number or the number of protons but different mass number. in this case both isotopes have 15 protons and an atomic number of 15. they also both have a zero charge and 15 electrons in their atom. the main difference between them is that p-31 has 16 neutrons in the nucleus whereas p-32 has 17 neutrons.