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| General
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| Name, Symbol, Number
| argon, Ar, 18
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| Chemical series | noble gases
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| Group, Period, Block
| 18 (VIIIA), 3A period 3 element is one of the chemical elements in the third row (or period of the periodic table of the elements. These are: Chemical elements in the third period Group 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 #Name 11 Na 12 Mg 13 Al 14 Si 15 P 16, pThe p-block of the periodic table of elements consists of the last six groups. In the elemental form of the p-block elements, the highest energy electron occupies a p- orbital. The p-block contains all of the nonmetals and semimetals, as well as some of t
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| DensityFor other meanings of density, see density (disambiguation Density (symbol: rho Greek: rho) is a measure of mass per unit of volume. The higher an object's density, the higher its mass per volume. The average density of an object equals its total mass div, Hardness
| 1.784 kg/m3Kilogram per cubic metre is the SI measure of density and is represented as kg/m³, where kg stands for kilogram and m³ stands for cubic metre. The density of water is about 1000 kg/m³, since a cubic metre of water weighs about a tonne. kg/m³" is sometimes (273 K), NA
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| AppearanceFor alternative meanings, see color (disambiguation). visual arts. Color (or colour is a sensation which (in humans) derives from the ability of the fine structure of the eye to distinguish three differently filtered analyses of a view. The perception of
| Colorless
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| Atomic properties
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| Atomic weightIn reference to a certain isotope of a chemical element, atomic weight (more accurately relative atomic mass though also called simply atomic mass is the mass of one atom of the isotope expressed in units atomic mass unit amu) such that the Carbon-12 isot | 39.948 amuTo help compare different orders of magnitude we list here masses between 6. 02 amu and 60. 2 amu (10-26 kg and 10-25 kg). See also masses of other orders of magnitude. lighter masses 6. 941 amu atomic mass of lithium 44. 955910 amu atomic mass of scandiu
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| Atomic radius (calc.) | no data ( 71 pm)
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| Covalent radius | 97 pm
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| van der Waals radius | 188 pm
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| Electron configuration
| [ Ne]3 s2 3p6
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| e- 's per energy level
| 2, 8, 8
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| Oxidation states ( Oxide) | 0 (unknown)
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| Crystal structure | cubic face centered
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| Physical properties
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| State of matter | gas ( nonmagnetic)
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| Melting point
| 83.8 K (−308.7 ° F)
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| Boiling point | 87.3 K (−302.4 °F)
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| Molar volume
| 22.56 ×10-6 m3/mol
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| Heat of vaporization | 6.447 kJ/mol
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| Heat of fusion | 1.188 kJ/mol
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| Vapor pressure | NA
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| Speed of sound
| 319 m/s at 293.15 K
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| Miscellaneous
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| Electronegativity | no data ( Pauling scale)
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| Specific heat capacity
| 520 J/(kg*K)
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| Electrical conductivity | no data
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| Thermal conductivity
| 0.01772 W/(m*K)
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| 1st ionization potential
| 1520.6 kJ/mol
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| 2nd ionization potential
| 2665.8 kJ/mol
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| 3rd ionization potential
| 3931 kJ/mol
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| 4th ionization potential
| 5771 kJ/mol
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| 5th ionization potential
| 7238 kJ/mol
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| 6th ionization potential
| 8781 kJ/mol
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| 7th ionization potential
| 11995 kJ/mol
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| 8th ionization potential
| 13842 kJ/mol
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| Most stable isotopes
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| SI units & STP are used except where noted.
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