Aluminium

Aluminum [[Atomic mass|Aluminum/Atomic mass]] +3   [[Periodic table of elements|Aluminum/Atomic symbol]] [[Atomic number|Aluminum/Atomic number]] 1s22s22p63s23p1 13,3,p [ ? ] Post-Transition Metal: Uses: Lewis acid catalysis Hazard: pyrophoric

Aluminum, also called aluminium, is a chemical element with atomic number Z = 13. It is the most reactive post-transition element metal, is the third most abundant metal on Earth, and the most abundant element (7.5%) in the Earth's crust.