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Compare Chlorine vs Argon

Comparing Chlorine (Cl) and Argon (Ar). Atomic numbers 17 and 18 with atomic masses 35.446 u and 39.792 u, classified as nonmetal 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
Cl
Chlorine
#17
Ar
Argon
#18

Periodic properties of the elements

ChlorineArgon
SymbolClAr
Atomic number1718
Group1718
Period33
Blockpp
Element categoryNonmetalNoble Gas

Physical properties

ChlorineArgon
Phase at STPGasGas
Density3.2 g/cm31.784 g/cm3
Atomic weight35.446 u39.792 u
Melting point171.6 K
-101.55 °C
-150.79 °F		83.81 K
-189.34 °C
-308.812 °F
Boiling point239.11 K
-34.04 °C
-29.272 °F		87.302 K
-185.848 °C
-302.5264 °F

Atomic properties

ChlorineArgon
Electronegativity (Pauling Scale)3.160
Electron affinity348.575 kJ/mol-96 kJ/mol
Oxidation states−1, +1, +2, +3, +4, +5, +6, +7
(a strongly acidic oxide)		0
Ionization energies
  1. 1251.2 kJ/mol
  2. 2298 kJ/mol
  3. 3822 kJ/mol
  4. 5158.6 kJ/mol
  5. 6542 kJ/mol
  6. 9362 kJ/mol
  7. 11018 kJ/mol
  8. 33604 kJ/mol
  9. 38600 kJ/mol
  10. 43961 kJ/mol
  11. 51068 kJ/mol
  12. 57119 kJ/mol
  13. 63363 kJ/mol
  14. 72341 kJ/mol
  15. 78095 kJ/mol
  16. 352994 kJ/mol
  17. 380760 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

ChlorineArgon
Shorthand configuration[Ne] 3s2 3p5 [Ne] 3s2 3p6
Full configuration1s2 2s2 2p6 3s2 3p5 1s2 2s2 2p6 3s2 3p6
Electrons per shell2, 8, 72, 8, 8

History

ChlorineArgon
DiscoveryCarl Wilhelm Scheele (1774)Lord Rayleigh, William Ramsay (1894)
First isolationCarl Wilhelm Scheele (1774)Lord Rayleigh, William Ramsay (1894)
Named bySir Humphry Davy (1810)
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