What is amber?, Yellow stone, Glass tube, Metal wire, Water vapor, What is friction?, Negative particle, Rubbing objects, Moving charges, Atomic center, What is electricity?, Atomic shell, Neutral force, Still matter, A flow of charge, What is an atom?, Energy source, Yellow crystal, a building block of matter, Electric wire, What is the nucleus?, Atom center, Outer layer, Moving charge, Rubbing force, What is a proton?, Negative particle, Stone fragment, Neutral particle, Positive particle, What is a neutron?, Positive particle, Neutral particle, Negative particle, Moving current, What is an electron?, Atom center, Positive particle, Negative particle, Neutral particle

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