Question

I need an answer asap

How do scientists determine the number of neutrons in an isotope of an atom?

They subtract the number of protons from the mass number.

They subtract the number of electrons from the mass number.

They subtract the number of protons and neutrons from the mass number.

They add the number of protons and electrons.

Answer 1

Scientists can calculate the number of neutrons by subtracting the atomic number from the atomic mass.

they subtract the protons