First, we need to determine the electron configuration for Ba (barium). The electron configuration depends on the number of electrons an atom or ion has. Since Ba is neutral, we can say that atomic number Z = number of protons = number of electrons. Barium has an atomic number of 56, so it has 56 electrons.
Draw a partial (valence-level) orbital diagram, and write the condensed ground-state electron configuration for each:
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Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.