Aluminium

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

Aluminum (American English) or aluminium<ref>With differing stress: alûminum (BrE), alumínium (BrE), see English spellings for key<7ref> (British English and the form used by the International Union of Pure and Applied Chemistry) is a chemical element with the atomic number Z = 13.

It is the most reactive post-transition element metal, the third most abundant element in the Earth's crust, and the most abundant metal in the Earth's crust.