Aluminum has 3 valence electrons. Valence electrons are the electrons in the outermost shell of an atom, which are involved in chemical bonding. Aluminum, with the atomic number 13, has an electron configuration of 1s² 2s² 2p⁶ 3s² 3p¹. The outermost shell is the third shell, which contains 3 electrons (3s² 3p¹). These 3 electrons are the valence electrons of aluminum.
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