Thorium atom, conceptual image. Computer illustration showing the orbits (blue lines) of electrons (bright spots) around the nucleus (round, centre) of a single thorium atom. Thorium is a radioactive metal element. Each thorium atom contains 90 electrons orbiting around the 90 protons and 90 neutrons (small spheres, centre) that make up its nucleus.

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TOP16085407

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達志影像

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RM

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須由TPG 完整授權

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