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Atomic nucleus in Mixed category icons

Atom
atom, atomic nucleus, electrons, physics atom
atom, atomic, electron, lithium, neutron, nucleus, proton
atom, atomic nucleus, electrons, physics atom
atom, atomic, chemistry, nucleus, physics, science
atomic, atom, nuclear, nucleus, physics, radiation, scientific
atom, core, radioactive, center, kernel, science, hard, focus, lab, solution, active, experiment, nucleus, atomic, test, laboratory, radiologic, chemistry