atomic number from mass number. mass number from atomic number. atomic number from electron number. isotope number from electron number.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The number of neutrons in an atom is found by subtracting
Possibilities:
- atomic number from mass number.
- mass number from atomic number.
- atomic number from electron number.
- isotope number from electron number.

atomic number from mass number.