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According to , Since the last shell of an aluminum-ion has eight electrons, the valence electrons of aluminum ion (Al3+) are eight.
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Aluminum has an atomic number of 13. The electronic configuration of Al is 1s2 2s2 2p6 3s2 3p1. Al3+ has only 10 electrons so the configuration of Al 3+ is 1s2 2s2 2p6. The highest energy level is 2 so the number of electrons in the highest level is the valence electrons which is 8.
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