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Animation of the structure of the 5dz2 orbital, one of the five 5d atomic orbitals. Orbitals contain an atom's electrons, which are found around the central atomic nucleus (not seen). Each orbital can hold two electrons. This 5d orbital is a different shape to the other four, which have four symmetrical lobes (see clips K002 8723, 8724 and 8680). An atomic orbital is a mathematical model of the location of an electron around an atomic nucleus. Electrons do not orbit the nucleus as might be imagined, but instead exist as a standing wave around it. The phases of the wave are arbitrarily coloured red (negative) and blue (positive).
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