yes.
The distance between the Nucleus and an electron cloud varies from atom to atom (element to element).
think of a basket ball as the nucleus.
The 1st electron cloud could be as far as 1-5 km away.
A lot of empty space
yes it was Dalton's Theory
The strong force holds atomic nuclei together.
Yes, an atom is mostly empty space. That said, the space is also "occupied" space because the electrons swirl around the atom's nucleus in orbit. So although the space is not always in use, it is in use quite frequently.
No .
radioactive
All atoms are mostly empty space, as the electromagnetic repulsion between atomic nuclei keep them from reaching each other (except under extreme pressure, as in the center of stars).
distance from the atomic nuclei
No, atomic nuclei is not required for a chemical reaction.
yes it was Dalton's Theory
Yes. A white dwarf is made mostly of electron degenerate matter, which consists of atomic nuclei surrounded by free electrons. The nuclei contain protons and neutrons.
The combination of two light atomic nuclei to form a heavier nucleus is called fusion.
The strong force holds atomic nuclei together.
Knowledge about atomic nuclei has been used to produce energy.
Neutron
No .
Yes, an atom is mostly empty space. That said, the space is also "occupied" space because the electrons swirl around the atom's nucleus in orbit. So although the space is not always in use, it is in use quite frequently.
Fission and/or fusion of atomic nuclei.