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What is a neutron?

  1. A negatively charged particle in the atom's nucleus

  2. A positively charged particle outside the atom's nucleus

  3. A neutral particle in the atom's nucleus

  4. A molecule made up of two or more atoms

The correct answer is: A neutral particle in the atom's nucleus

A neutron is a subatomic particle found in the nucleus of an atom. It has no net electric charge, therefore it is neutral. Option A cannot be correct because electrons are the negatively charged particles in an atom, not neutrons. Option B cannot be correct because protons are the positively charged particles in an atom, not neutrons. Option D is incorrect because molecules are made up of multiple atoms, not individual particles within an atom's nucleus.