In between atoms is nothing. Inside atoms (between the electrons and the nucleus) is more nothing. Electrons are point particles and have no size. In between the protons and neutrons of the nucleus is nothing. Inside a proton are quarks, and between those quarks is nothing. Quarks themself are point particles and have no size.
In between atoms is nothing. Inside atoms (between the electrons and the nucleus) is more nothing. Electrons are point particles and have no size. In between the protons and neutrons of the nucleus is nothing. Inside a proton are quarks, and between those quarks is nothing. Quarks themself are point particles and have no size.
So in total 100% of matter is empty space.