SAMPLE PROBLEM 8.5
Identifying an Element from Successive Ionization Energies
PLAN:
SOLUTION:
Look for a large increase in energy that indicates that all of the valence electrons have been removed.
The largest increase occurs at IE6, that is, after the 5th valence electron has been removed. The element must have five valence electrons with a valence configuration of 3s23p3, The element must be phosphorus. P (Z = 15).
The complete electronic configuration is: 1s22s22p63s23p3.
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