Question

How do calculate the mass number of an atom

Answer 1

you add the protons and the nuetrons together i think

Answer 2

To calculate the atomic mass of a single atom of an element, add up the mass of protons and neutrons. Example: Find the atomic mass of an isotope of carbon that has 7 neutrons. You can see from the periodic table that carbon has an atomic number of 6, which is its number of protons.