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Compare Iron vs Ruthenium

Comparing Iron (Fe) and Ruthenium (Ru). Atomic numbers 26 and 44 with atomic masses 55.845 u and 101.072 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
Ru
Ruthenium
#44

Periodic properties of the elements

IronRuthenium
SymbolFeRu
Atomic number2644
Group88
Period45
Blockdd
Element categoryTransition MetalTransition Metal

Physical properties

IronRuthenium
Phase at STPSolidSolid
Density7.874 g/cm312.45 g/cm3
Atomic weight55.8452 u101.072 u
Melting point1811 K
1537.85 °C
2800.13 °F		2607 K
2333.85 °C
4232.93 °F
Boiling point3134 K
2860.85 °C
5181.53 °F		4423 K
4149.85 °C
7501.73 °F

Atomic properties

IronRuthenium
Electronegativity (Pauling Scale)1.832.2
Electron affinity14.785 kJ/mol100.96 kJ/mol
Oxidation states−4, −2, −1, 0, +1, +2, +3, +4, +5, +6, +7
(an amphoteric oxide)		−4, −2, 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. 710.2 kJ/mol
  2. 1620 kJ/mol
  3. 2747 kJ/mol

Electron configuration

IronRuthenium
Shorthand configuration[Ar] 3d6 4s2 [Kr] 4d7 5s1
Full configuration1s2 2s2 2p6 3s2 3p6 3d6 4s2 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d7 5s1
Electrons per shell2, 8, 14, 22, 8, 18, 15, 1

History

IronRuthenium
DiscoveryMiddle East (5000 BC)Karl Ernst Claus (1844)
First isolationKarl Ernst Claus (1844)
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