Ontario Grade 9 Science Class Practice Exam

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.