13 - Aluminium General properties Alternative name of aluminium is aluminum (US, informal) Appearance of aluminium is silvery gray metallic Standard atomic weight (Ar) of aluminium is 26.9815385(7) Atomic number (Z) of aluminium is 13 Group of aluminium is 13 (boron group) Period of aluminium is 3 Block of aluminium is p-block Element category of aluminium is post-transition metal, sometimes considered a metalloid Electron configuration of aluminium is [Ne] 3s2 3p1 Electrons of aluminium per shell 2, 8, 3 Part:- 01