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Compare Iron vs Osmium

Comparing Iron (Fe) and Osmium (Os). Atomic numbers 26 and 76 with atomic masses 55.845 u and 190.233 u, classified as 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
Fe
Iron
#26
Os
Osmium
#76

Periodic properties of the elements

IronOsmium
SymbolFeOs
Atomic number2676
Group88
Period46
Blockdd
Element categoryTransition MetalTransition Metal

Physical properties

IronOsmium
Phase at STPSolidSolid
Density7.874 g/cm322.59 g/cm3
Atomic weight55.8452 u190.233 u
Melting point1811 K
1537.85 °C
2800.13 °F		3306 K
3032.85 °C
5491.13 °F
Boiling point3134 K
2860.85 °C
5181.53 °F		5285 K
5011.85 °C
9053.33 °F

Atomic properties

IronOsmium
Electronegativity (Pauling Scale)1.832.2
Electron affinity14.785 kJ/mol103.99 kJ/mol
Oxidation states−4, −2, −1, 0, +1, +2, +3, +4, +5, +6, +7
(an amphoteric oxide)		−4, −2, −1, 0, +1, +2, +3, +4, +5, +6, +7, +8
(a mildly acidic oxide)
Ionization energies
  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
  1. 840 kJ/mol
  2. 1600 kJ/mol

Electron configuration

IronOsmium
Shorthand configuration[Ar] 3d6 4s2 [Xe] 4f14 5d6 6s2
Full configuration1s2 2s2 2p6 3s2 3p6 3d6 4s2 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d6 6s2
Electrons per shell2, 8, 14, 22, 8, 18, 32, 14, 2

History

IronOsmium
DiscoveryMiddle East (5000 BC)Smithson Tennant (1803)
First isolationSmithson Tennant (1803)
Named bySmithson Tennant
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