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The energy required to remove a 3p electron from an atom is directly related to the ionization energy of the atom. The ionization energy of an atom increases as the atomic number increases. This is because the increased number of protons in the nucleus results in a stronger electrostatic attraction between the nucleus and the electrons. As a result, it is easier to remove a 3p electron from a sulfur atom than from a phosphorus atom because sulfur has a lower atomic number than phosphorus.