Aluminum AL. By Examplius. Atomic Structure Slide. Protons= 13 Neutrons=14 Electrons=13 EXTRA CREDIT: shell # 3 Valence electron # 3. Properties Slide. Aluminum is a metal The atomic mass of aluminum is about 27 The density is 2.7 g/cm Melting point 660.4 Celsius
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Valence electron # 3