Question: Given an element's atomic number and mass number, how can you tell the number of protons and neutrons in its nucleus?
Number of protons = mass number; number of neutrons atomic number - mass number
Number of protons = atomic number; number of neutrons = mass number + atomic number
Number of protons = atomic number; number of neutrons = mass number - atomic number
Answer: The correct way to determine the number of protons and neutrons in an element's nucleus based on its atomic number and mass number is:
Number of protons = atomic number Number of neutrons = mass number - atomic number
So, the correct statement is: "Number of protons = atomic number; number of neutrons = mass number - atomic number."
