Question

An atom of phosphorus has an atomic number of 15 and a mass number of 31. How many neutrons does it contain

Answer 1

16 neutrons
This is the isotope phosphorus-31. It has 15 protons, 15 electrons, and 16 neutrons.

Answer 2

Answer: 16 neutrons

Step-by-step explanation:

Mass-atomic number

31-15=16