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Compare Aluminium vs Iron

Comparing Aluminium (Al) and Iron (Fe). Atomic numbers 13 and 26 with atomic masses 26.982 u and 55.845 u, classified as post-transition metal and transition metal. Below: a side-by-side comparison of their physical, atomic, electron-configuration and historical properties, including density, melting and boiling points, ionization energies, oxidation states and discovery history.

vs
Al
Aluminium
#13
Fe
Iron
#26

Periodic properties of the elements

AluminiumIron
SymbolAlFe
Atomic number1326
Group138
Period34
Blockpd
Element categoryPost-Transition MetalTransition Metal

Physical properties

AluminiumIron
Phase at STPSolidSolid
Density2.7 g/cm37.874 g/cm3
Atomic weight26.9815 u55.8452 u
Melting point933.47 K
660.32 °C
1220.576 °F		1811 K
1537.85 °C
2800.13 °F
Boiling point2743 K
2469.85 °C
4477.73 °F		3134 K
2860.85 °C
5181.53 °F

Atomic properties

AluminiumIron
Electronegativity (Pauling Scale)1.611.83
Electron affinity41.762 kJ/mol14.785 kJ/mol
Oxidation states−2, −1, +1, +2, +3
(an amphoteric oxide)		−4, −2, −1, 0, +1, +2, +3, +4, +5, +6, +7
(an amphoteric oxide)
Ionization energies
  1. 577.5 kJ/mol
  2. 1816.7 kJ/mol
  3. 2744.8 kJ/mol
  4. 11577 kJ/mol
  5. 14842 kJ/mol
  6. 18379 kJ/mol
  7. 23326 kJ/mol
  8. 27465 kJ/mol
  9. 31853 kJ/mol
  10. 38473 kJ/mol
  11. 42647 kJ/mol
  12. 201266 kJ/mol
  13. 222316 kJ/mol
  1. 762.5 kJ/mol
  2. 1561.9 kJ/mol
  3. 2957 kJ/mol
  4. 5290 kJ/mol
  5. 7240 kJ/mol
  6. 9560 kJ/mol
  7. 12060 kJ/mol
  8. 14580 kJ/mol
  9. 22540 kJ/mol
  10. 25290 kJ/mol
  11. 28000 kJ/mol
  12. 31920 kJ/mol
  13. 34830 kJ/mol
  14. 37840 kJ/mol
  15. 44100 kJ/mol
  16. 47206 kJ/mol
  17. 122200 kJ/mol
  18. 131000 kJ/mol
  19. 140500 kJ/mol
  20. 152600 kJ/mol
  21. 163000 kJ/mol
  22. 173600 kJ/mol
  23. 188100 kJ/mol
  24. 195200 kJ/mol
  25. 851800 kJ/mol
  26. 895161 kJ/mol

Electron configuration

AluminiumIron
Shorthand configuration[Ne] 3s2 3p1 [Ar] 3d6 4s2
Full configuration1s2 2s2 2p6 3s2 3p1 1s2 2s2 2p6 3s2 3p6 3d6 4s2
Electrons per shell2, 8, 32, 8, 14, 2

History

AluminiumIron
PredictionAntoine Lavoisier (1782)
DiscoveryHans Christian Ørsted (1824)Middle East (5000 BC)
Named byHumphry Davy (1812)
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