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. 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). The next shell shows the eight electrons in the second shell (the 2s and 2p orbitals). Finally, there are seven electrons in the third shell (the 3s and 3p orbitals). It is the unpaired electron (centre left) in the outer shell that makes chlorine an extremely reactive element. The isotope shown here is chlorine-35, with 17 protons (red) and 18 neutrons (blue) in the nucleus. Both isotopes of chlorine (chlorine-35 and chlorine-37) have the same electronic structure.
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