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RHYS LEWIS, AHS, DECD, UNISA / ANIMATE4.COM / SCIENCE PHOTO LIBRARY RHYS LEWIS, AHS, DECD, UNISA / ANIMATE4.COM / SCIENCE PHOTO LIBRARY
Chlorine electronic structure. Animation of the electronic structure of the element chlorine. An atom of this element has 17 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 are seven electrons in the third shell (the 3s and 3p orbitals). The electron configuration is 2,8,7. The isotope shown here is chlorine-35, with a nucleus of 17 protons (red) and 18 neutrons (blue). All isotopes of an element have the same electronic structure.
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