13 - Aluminium post-transition metal
Discovered by Hans Christian Ørsted in 1827
Aluminium (or aluminum; see different endings) is a chemical element in the boron group with symbol Al and atomic number 13. It is a silvery-white, soft, nonmagnetic, ductile metal. Aluminium is the third most abundant element (after oxygen and silicon), and the most abundant metal, in the Earth's crust.
H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
57-71 La-Lu Lanthanides
89-103 Ac-Lr Actinides
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 3 | 2 in 3s + 1 in 3p |
27 u Atomic Mass
1.8 Å Atomic Radius
2.79k K Boiling Point
1.21 Å Covalent Radius
2.7 g/cm³ Density
41.8 Electron Affinity
1.61 Electronegativity
5.99 eV First Ionization Energy
933 K Melting Point
3 Number of Shells
3 Electron Valency
13 Atomic Number
2, 8, 3 Electron Shell Occupations
0.897 J/(g K) Specific Heat