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Compare Copper vs Roentgenium

Comparing Copper (Cu) and Roentgenium (Rg). Atomic numbers 29 and 111 with atomic masses 63.546 u and 281 u, classified as transition metal and unknown. 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
Cu
Copper
#29
Rg
Roentgenium
#111

Periodic properties of the elements

CopperRoentgenium
SymbolCuRg
Atomic number29111
Group1111
Period47
Blockdd
Element categoryTransition MetalUnknown

Physical properties

CopperRoentgenium
Phase at STPSolidSolid
Density8.96 g/cm328.7 g/cm3
Atomic weight63.5463 u281 u
Melting point1357.77 K
1084.62 °C
1984.316 °F		-
Boiling point2835 K
2561.85 °C
4643.33 °F		-

Atomic properties

CopperRoentgenium
Electronegativity (Pauling Scale)1.90
Electron affinity119.235 kJ/mol151 kJ/mol
Oxidation states−2, 0, +1, +2, +3, +4
(a mildly basic oxide)		(−1), (+1), (+3), (+5), (+7)
(predicted)
Ionization energies
  1. 745.5 kJ/mol
  2. 1957.9 kJ/mol
  3. 3555 kJ/mol
  4. 5536 kJ/mol
  5. 7700 kJ/mol
  6. 9900 kJ/mol
  7. 13400 kJ/mol
  8. 16000 kJ/mol
  9. 19200 kJ/mol
  10. 22400 kJ/mol
  11. 25600 kJ/mol
  12. 35600 kJ/mol
  13. 38700 kJ/mol
  14. 42000 kJ/mol
  15. 46700 kJ/mol
  16. 50200 kJ/mol
  17. 53700 kJ/mol
  18. 61100 kJ/mol
  19. 64702 kJ/mol
  20. 163700 kJ/mol
  21. 174100 kJ/mol
  22. 184900 kJ/mol
  23. 198800 kJ/mol
  24. 210500 kJ/mol
  25. 222700 kJ/mol
  26. 239100 kJ/mol
  27. 249660 kJ/mol
  28. 1067358 kJ/mol
  29. 1116105 kJ/mol
  1. 1022.7 kJ/mol
  2. 2074.4 kJ/mol
  3. 3077.9 kJ/mol
  4. 4052.4 kJ/mol
  5. 5306.7 kJ/mol

Electron configuration

CopperRoentgenium
Shorthand configuration[Ar] 3d10 4s1 [Rn] 5f14 6d9 7s2
Full configuration1s2 2s2 2p6 3s2 3p6 3d10 4s1 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d9 7s2
Electrons per shell2, 8, 18, 12, 8, 18, 32, 32, 17, 2

History

CopperRoentgenium
DiscoveryMiddle East (9000 BC)Gesellschaft für Schwerionenforschung (1994)
Named byGSI
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