The 4th ionization energy of aluminum is approximately 154 eV. From which orbital is the electron being removed?

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MCQS on the chemistry, properties, and reactivity of metal-containing compounds. Topics include atomic structure and electron configurations, bonding theories, ionic bonding, ionic solids and packing structures, band theory, alloys, semiconductors, and superconductors, inorganic acids and bases, and the properties and compounds of Group 1-7 elements.
 


The 4th ionization energy of aluminum is approximately 154 eV. From which orbital is the electron being removed?