SymbolAl
Latin nameAluminium
Atomic number13
Period3
Element categoryMetals
Relative atomic mass26.981539
GroupIII.A
Electronegativity
1.5
Oxidation numbers
3
Electron configuration
1s2 2s2 2p6 3s2 3p1
Density [g/cm3]
2.6989
State
Solid
Melting point [°C]
660.37
Boiling point [°C]
2467
Atomic radius [pm]
118
Covalent radius [pm]
118
Thermal conductivity [W m-1K-1]
237
Heat capacity [J K-1g-1]
0.9
Discovery
1825
Hardness [Mohs scale]
2.9
Vickers hardness [MPa]
167
Brinell hardness [MPa]
245
Young's modulus [GPa]
70
Electrical conductivity [S m-1]
37.7 · 106
Electrical resistivity [10-6Ω.m]
0.0267
Shear modulus [GPa]
26
1.st ionization energy [eV]
5.9858
2.nd ionization energy [eV]
18.828
3.rd ionization energy [eV]
28.447
Stable isotopes
1
Unstable isotopes
7