Yes that is right.
If by occupy, you mean what space do they occupy since they are subatomic they can fit in anything. However we don't know if they can go inside black hole but since they are infinitely dense it seems unlikely.
compression
Black holes would normally be heavier than the solar system, but they would occupy less space, being extremely dense.
Down to something called the Avogadro Constant. It states that 1 mole of ANY gas will always occupy the same amount of space.
Two electrons can occupy the same space orbital in an atom if they have different spins. This is known as Hund's Rule.
The soap is more dense than the sponge because it has greater mass.
Even though a sponge may be the same size as a book, the sponge has hundreds of holes in it. The book has far more material in the same amount of space that the sponge takes up. In other words, the book is far more dense than the sponge.
Volume
If by occupy, you mean what space do they occupy since they are subatomic they can fit in anything. However we don't know if they can go inside black hole but since they are infinitely dense it seems unlikely.
the gases, due to their low density in comparison to solids or fluids occupy the greatest amount of space
This is a very unspecific question, the amount of matter in a given space depends on what's in that space, and how much of it there is (as well as how dense it is).
True
A single electron has an infinitesimal volume; do not confuse with the electron cloud.
yes,smoke does have mass and it does occupy space
A stone has a solid mass and does occupy space.
Matter does occupy space, and does have mass.
Heat is a form of energy. It can be transmitted through space but it does not occupy space.