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Compare Helium vs Neon

Comparing Helium (He) and Neon (Ne). Atomic numbers 2 and 10 with atomic masses 4.003 u and 20.18 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
He
Helium
#2
Ne
Neon
#10

Periodic properties of the elements

HeliumNeon
SymbolHeNe
Atomic number210
Group1818
Period12
Blocksp
Element categoryNoble GasNoble Gas

Physical properties

HeliumNeon
Phase at STPGasGas
Density0.1786 g/cm30.9002 g/cm3
Atomic weight4.0026 u20.1797 u
Melting point0.95 K
-272.2 °C
-457.96 °F		24.56 K
-248.59 °C
-415.462 °F
Boiling point4.222 K
-268.928 °C
-452.0704 °F		27.104 K
-246.046 °C
-410.8828 °F

Atomic properties

HeliumNeon
Electronegativity (Pauling Scale)00
Electron affinity-48 kJ/mol-116 kJ/mol
Oxidation states00
Ionization energies
  1. 2372.3 kJ/mol
  2. 5250.5 kJ/mol
  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

Electron configuration

HeliumNeon
Shorthand configuration1s2 [He] 2s2 2p6
Full configuration1s2 1s2 2s2 2p6
Electrons per shell22, 8

History

HeliumNeon
PredictionWilliam Ramsay (1897)
DiscoveryPierre Janssen, Norman Lockyer (1868)William Ramsay, Morris Travers (1898)
First isolationWilliam Ramsay, Per Teodor Cleve, Abraham Langlet (1895)William Ramsay, Morris Travers (1898)
Named byEdward Frankland, Norman Lockyer (1868)
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