Respuesta :
the answer is D. the nucleus contains the protons and neutrons which takes up most of the mass of the atom
Answer:The correct answer is option D.
Explanation:
An atom is smallest unit of a matter or substance.It consist of three subatomic particles : electrons, protons, neutrons.
Protons are nucleus are located in the center of an atom where while mass of an atom is concentrated.
Atomic mass = Number of protons + Number of neutrons
Electrons are located outside the nucleus where they orbit in different energy levels around the nucleus.
Hence, from the given options the correct option describing the nucleus of an atom is option D.