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Magnesium atom structure

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ROGER HARRIS / SCIENCE PHOTO LIBRARY ROGER HARRIS / SCIENCE PHOTO LIBRARY

Caption

Magnesium atom. Diagram of an atom of the element magnesium, showing the electron orbitals surrounding the nucleus. Magnesium is the 12th element, and has 12 protons (red) in its nucleus, along with, usually, 12 neutrons (blue), although it has other isotopes. Magnesium has 12 electrons, and each of its orbitals can hold a maximum of two. Orbitals are filled from the lowest energy (nearest the nucleus) first, so there are two electrons in the inner 1s orbital, and two in the higher energy 2s orbital (green spheres), and two each in the slightly higher energy 2p orbitals (blue, red and yellow). Outside the 2p orbitals is a spherical 3s shell, which contains the remaining two electrons. For clarity, solid lines show the paths of the electrons. In reality, electrons can be found anywhere, and the shape of each orbital is based only on where it is most likely to be found.

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