A line graph has distance from the nucleus in angstroms on the X-axis, ranging from 0 to 10 with intervals of 1, and probability on the Y-axis (unscaled, increasing).  Curves are shown for 1s, 2s, and 2p orbitals. The 1s electrons have a sharp, high peak of probability at around 0.5 angstroms then return to near-0 probability by 2.5 angstroms from the nucleus.  1s electrons are much closer to the nucleus — they screen the valence electrons. The 2s electrons have a very small peak at 0.5 angstroms, returning to 0 probability by 1 angstrom; 2s electrons experience greater nuclear attraction than the 2p electrons.  The curve then reaches a broad, medium-height probability at around 2.5 angstroms, before gradually decreasing to near-0 by 7 angstroms. The 2p electrons have a broad, medium-height probability roughly approximating the second portion of the 2s curve, except they peak at around 2 angstroms before gradually decreasing to near-0, again by 7 angstroms.
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