What is the charge of a proton?, Positive, Negative, Neutral, Varies, What is the charge of a neutron?, Positive, Negative, Neutral, Varies, What particles are found in the nucleus?, Electrons only, Protons only, Neutrons only, Protons and neutrons, What is the charge of an electron?, Positive, Negative, Neutral, Varies, What is the smallest particle of an element?, Molecule, Atom, Compound, Mixture.

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