The mass number of an atom is obtained by totaling the number of electrons and neutrons protons and electrons protons and neutrons

The answer is: The mass number of an atom is obtained by totaling the number of protons and neutrons.

The atomic mass can be calculated by the sum of the protons and neutron mass of an element.

We should not confuse the atomic mass with the relative atomic mass since the relative atomic mass of an element is the average mass of its particles/atoms compared to 1/12th the mass of a carbon-12 particle/atom.

Have a nice day!

the precambrian aged rocks could be found in australia. australia is a region that has a lot of ancient civilization history from million years ago. in this region, there are a lot of recognizable fossils buried in its land which is considered a precambrian-aged rocks

answer; ///(true)/// fusion occurs in the sun's core;