Argon, with filled n = 1, 2, and 3 principal shells, has three peaks. In contrast, neon, with filled n = 1 and 2 principal shells, has two peaks. Because helium has only one filled shell ( n = 1), it shows only a single peak. Each peak in a given plot corresponds to the electron density in a given principal shell. In Ar, the 1 s electrons have a maximum at ≈2 pm, the 2 s and 2 p electrons combine to form a maximum at ≈18 pm, and the 3 s and 3 p electrons combine to form a maximum at ≈70 pm.įigure 7.4 "Plots of Radial Probability as a Function of Distance from the Nucleus for He, Ne, and Ar" also shows that there are distinct peaks in the total electron density at particular distances and that these peaks occur at different distances from the nucleus for each element. In Ne, the 1 s electrons have a maximum at ≈8 pm, and the 2 s and 2 p electrons combine to form another maximum at ≈35 pm (the n = 2 shell). In He, the 1 s electrons have a maximum radial probability at ≈30 pm from the nucleus.
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