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The Concept Map you are trying to access has information related to:
NEUTRONS ???? no charge, ELECTRONS circle around NUCLEUS, ATOMS central core called NUCLEUS, ELECTRONS charge is negative, ELEMENTS made of indivisible ATOMS, MATTER made of ELEMENTS, NUCLEUS made of PROTONS, NUCLEUS made of NEUTRONS, ATOMS of two or more elements form COMPOUNDS, PROTONS charge is +, ATOMS made of ELECTRONS