5. the ______________ of an element is the total number of protons and neutrons in the ______________ of the…
5. the ______________ of an element is the total number of protons and neutrons in the ______________ of the atom.
Answer
Brief Explanations:
The mass - number of an element is calculated by adding the number of protons and neutrons in the nucleus of an atom.
Answer:
mass - number; nucleus