Chemicool

Ar

18

39.948
Argon
General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles

General
Name Argon Symbol Ar
atomic number 18 Atomic weight 39.948
Density @ 293 K 0.0017824 g/cm3 Atomic volume 28.5 cm3/mol
Group Noble Gas discovered 1894

States
state (s, l, g) g
melting point 84 K boiling point 87.3 K
Heat of fusion 1.188 kJ/mol Heat of vaporization 6.447 kJ/mol
Back to the top

Energies
1st ionization energy 1520.5 kJ/mole electronegativity
2nd ionization energy 2665.8 kJ/mole electron affinity kJ/mole
3rd ionization energy 3930.8 kJ/mole Specific heat 0.520 J/gK
heat atomization 0 kJ/mole atoms

Oxidation & Electrons
Shells 2,8,8 electron configuration [Ne] 3s2 3p6
minimum oxidation number 0 maximum oxidation number 0
min. common oxidation no. 0 max. common oxidation no. 0
Back to the top

Appearance & Characteristics
structure fcc: face-centered cubic color colorless
uses lasers, light bulbs toxicity no
hardness mohs characteristics Inert

Reactions
reaction with air none reaction with 6M HCl none
reaction with 6M HCl none reaction with 15M HNO3 none
reaction with 6M NaOH none
Back to the top

Other Forms
number of isotopes 3 hydride(s) none
oxide(s) none chloride(s) none

Radius
ionic radius (2- ion) pm ionic radius (1- ion) pm
atomic radius 98 pm ionic radius (1+ ion) pm
ionic radius (2+ ion) pm ionic radius (3+ ion) pm
Back to the top

Conductivity
thermal conductivity 0.02 J/m-sec-deg electrical conductivity 0 1/mohm-cm
polarizability 1.586 A^3

Abundance
source Air rel. abund. solar system 5.004 log
abundance earth's crust 0.5 log cost, pure 0.5 $/100g
cost, bulk $/100g
Back to the top
World Wide Web presentation of Chemicool Periodic Table is © Copyright 1996-99 by David D. Hsu. Some data were provided by and used with the permission of JCE Software and is owned and copyright by the Division of Chemical Education, Inc. Additional data were provided by Perkin-Elmer through Peter Lykos of IIT. The information may not be redistributed without the permission of David Hsu or JCE Software.