Answer:
C. "A group of protons and neutrons that are surrounded by electrons"
Explanation:
Protons and Neutrons make up the nucleus, which is the center of the atom. Electrons fly around the nucleus; they carry a negative charge, and the protons carry a positive charge.
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A group of protons and neutrons that are surrounded by electrons
the group of protons and neutrons form the nucleus and the surrounding electrons form the orbitals