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atom can form ion
atom can form isotope
atom has definition smallest unit of element
atom has definition that retains traits of element
atom has example carbon atom
atom has example hydrogen atom
atom has example nitrogen atom
atom has example oxygen atom
atom has example phosphorus atom
atom has example sulfur atom
atom composed of proton
atom composed of neutron
atom composed of electron
atom contained in molecule
atom has characteristic atomic number
atom has characteristic atomic weight
atom described by periodic table
atom component in element
atom component in matter