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Argon, 18Ar |
| Argon |
|---|
| Pronunciation | (AR-gon) |
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| Appearance | colourless gas exhibitin a laylock/violet glowe whan placed in a heich voltage electric field |
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| Standard atomic weight Ar, std(Ar) | [7001397920000000000♠39.792, 7001399630000000000♠39.963] conventional: 7001399480000000000♠39.948 |
|---|
| Argon in the periodic cairt |
|---|
|
|
| Atomic nummer (Z) | 18 |
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| Group | group 18 (noble gases) |
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| Period | period 3 |
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| Block | p-block |
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| Element category | Noble gas |
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| Electron confeeguration | [Ne] 3s2 3p6 |
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| Electrons per shell | 2, 8, 8 |
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| Pheesical properties |
|---|
| Phase at STP | gas |
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| Meltin pynt | 83.81 K (−189.34 °C, −308.81 °F) |
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| Bylin pynt | 87.302 K (−185.848 °C, −302.526 °F) |
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| Density (at STP) | 1.784 g/L |
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| whan liquid (at b.p.) | 1.40 g/cm3 |
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| Treeple pynt | 83.8058 K, 68.89[1] kPa |
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| Creetical pynt | 150.687 K, 4.863[1] MPa |
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| Heat o fusion | 1.18 kJ/mol |
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| Heat o vapourisation | 6.43 kJ/mol |
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| Molar heat capacity | 5R/2 = 20.786 (Cp) J/(mol·K) |
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Vapour pressur
| P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
|
| at T (K)
|
|
47
|
53
|
61
|
71
|
87
|
|
| Atomic properties |
|---|
| Oxidation states | 0 |
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| Electronegativity | Pauling scale: no data |
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| Ionisation energies | |
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| Covalent radius | 106±10 pm |
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| Van der Waals radius | 188 pm |
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 Colour lines in a spectral rangeSpectral lines o argon |
| Ither properties |
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| Naitural occurrence | primordial |
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| Creestal structur | face-centred cubic (fcc) |
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| Speed o soond | (gas, 27 °C) 323 m/s |
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| Thermal conductivity | 17.72×10−3 W/(m·K) |
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| Magnetic orderin | diamagnetic[2] |
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| CAS Nummer | 7440–37–1 |
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| History |
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| Diskivery | Lord Rayleigh an William Ramsay (1894) |
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| First isolation | Lord Rayleigh an William Ramsay (1894) |
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| Main isotopes o argon |
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|
|
| Decay modes in parentheses is predict, but hisna yet been observed |
| | references |
| style="text-align:left"|
|
|
|
in
|
calc from C
|
diff
|
report
|
ref
|
| C
|
−189.34
|
—
|
—
|
|
|
| K
|
83.81
|
83.81
|
0
|
|
|
| F
|
−308.81
|
−308.81
|
0
|
|
|
| WD
|
-189.34 !-189.34 Celsius 
|
|
|
|
| input
|
C: −189.34, K: 83.81, F: −308.81
|
| comment
|
|
| style="text-align:left"|
|
|
|
in
|
calc from C
|
diff
|
report
|
ref
|
| C
|
−185.848
|
—
|
—
|
|
|
| K
|
87.302
|
87.302
|
0
|
|
|
| F
|
−302.526
|
−302.526
|
0
|
|
|
| WD
|
-185.85 !-185.85 Celsius
|
|
|
|
| input
|
C: −185.848, K: 87.302, F: −302.526
|
| comment
|
|
References
Thir references will appear in the airticle, but this list appears anerly on this page.
- ↑ a b Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nt ed.). CRC Press. p. 4.121. ISBN 1439855110.
- ↑ Magnetic susceptibility of the elements and inorganic compounds, in Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.
