The central nucleus and the almost empty space around it containing electrons
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Space
The nucleus contains the mass.
No region has all the weight, but the vast majority of the mass of an atom is in the nucleus.
No, a proton is a subatomic particle that is found in the nucleus of an atom. The majority of the volume of an atom is made up of the empty space surrounding the nucleus, where the electrons are found.
The nucleus is the small and dense center of an atom. It contains protons and neutrons, which are the subatomic particles that make up the majority of the atom's mass.