What particles make up most of the mass of an atom.What makes up mot of te volume of an atom?

An electron weighs about 1/1836 of a proton, so as far as an atom is concerned, all the mass is in the nucleus, with the protons and neutrons.

But the electrons are rotating in their orbits a long way (in proton size terms) from the nucleus. So most of the volume of an atom is empty space.