Iggy's Element Bonanza! Element: Aluminum Atomic Symbol: Al Atomic Number: 13 Iggy: Aluminum is the lightest of the Post-Transition Metals group, these metals are like metals, but are more soft or brittle, and have lower melting and boiling points than the Transition Metals. Aluminum is common in soda cans, aluminum foil, and sinks. Aluminum is monoisotopic with one stable isotope, Aluminum-27.