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Compare Neon vs Argon

Comparing Neon (Ne) and Argon (Ar). Atomic numbers 10 and 18 with atomic masses 20.18 u and 39.792 u, classified as noble gas and noble gas. 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
Ne
Neon
#10
Ar
Argon
#18

Periodic properties of the elements

NeonArgon
SymbolNeAr
Atomic number1018
Group1818
Period23
Blockpp
Element categoryNoble GasNoble Gas

Physical properties

NeonArgon
Phase at STPGasGas
Density0.9002 g/cm31.784 g/cm3
Atomic weight20.1797 u39.792 u
Melting point24.56 K
-248.59 °C
-415.462 °F		83.81 K
-189.34 °C
-308.812 °F
Boiling point27.104 K
-246.046 °C
-410.8828 °F		87.302 K
-185.848 °C
-302.5264 °F

Atomic properties

NeonArgon
Electronegativity (Pauling Scale)00
Electron affinity-116 kJ/mol-96 kJ/mol
Oxidation states00
Ionization energies
  1. 2080.7 kJ/mol
  2. 3952.3 kJ/mol
  3. 6122 kJ/mol
  4. 9371 kJ/mol
  5. 12177 kJ/mol
  6. 15238 kJ/mol
  7. 19999 kJ/mol
  8. 23069.5 kJ/mol
  9. 115379.5 kJ/mol
  10. 131432 kJ/mol
  1. 1520.6 kJ/mol
  2. 2665.8 kJ/mol
  3. 3931 kJ/mol
  4. 5771 kJ/mol
  5. 7238 kJ/mol
  6. 8781 kJ/mol
  7. 11995 kJ/mol
  8. 13842 kJ/mol
  9. 40760 kJ/mol
  10. 46186 kJ/mol
  11. 52002 kJ/mol
  12. 59653 kJ/mol
  13. 66199 kJ/mol
  14. 72918 kJ/mol
  15. 82473 kJ/mol
  16. 88576 kJ/mol
  17. 397605 kJ/mol
  18. 427066 kJ/mol

Electron configuration

NeonArgon
Shorthand configuration[He] 2s2 2p6 [Ne] 3s2 3p6
Full configuration1s2 2s2 2p6 1s2 2s2 2p6 3s2 3p6
Electrons per shell2, 82, 8, 8

History

NeonArgon
PredictionWilliam Ramsay (1897)
DiscoveryWilliam Ramsay, Morris Travers (1898)Lord Rayleigh, William Ramsay (1894)
First isolationWilliam Ramsay, Morris Travers (1898)Lord Rayleigh, William Ramsay (1894)
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