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Choose the correct definition of an atom's atomic number. choose the correct definition of an atom's atomic number. an atom's atomic number is the number of protons it has in its nucleus. an atom's atomic number is the number of particles it has in its nucleus. an atom's atomic number is the number of electrons it has in its nucleus. an atom's atomic number is the number of neutrons it has in its nucleus.

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I believe the answer is that the atomic number is the number of protons in the nucleus of an atom.An atom is the smallest particle of an element that can take part in a chemical reaction. An atom contains nucleus and the energy levels , the nucleus contains the protons and the neutrons while the energy levels contain electrons.
izzyivantierney

Answer:

protons

An atom's atomic number is the number of protons it has in its nucleus.

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