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RHYS LEWIS, AHS, DECD, UNISA / ANIMATE4.COM / SCIENCE PHOTO LIBRARY RHYS LEWIS, AHS, DECD, UNISA / ANIMATE4.COM / SCIENCE PHOTO LIBRARY
Sodium electronic structure. Animation of the electronic structure of the element sodium. An atom of this element has 11 electrons, shown here as black dots in shells around the nucleus (centre). The electrons are in three shells. The animation zooms in to show the two electrons in the first shell (both in the 1s orbital). There are eight electrons filling the second shell (the 2s and 2p orbitals). Finally, there is one electron in the third shell (the 3s orbital). The electron configuration is 2,8,1. The isotope shown here is sodium-23, with a nucleus of 11 protons (red) and 12 neutrons (blue). All isotopes of an element have the same electronic structure.
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