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Argon

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Argon, ₁₈Ar

Vial containing a violet glowing gas

Argon

Pronunciation

/ˈɑːrɡɒn/ (AR-gon)

Appearance

colourless gas exhibitin a laylock/violet glowe whan placed in a heich voltage electric field

Standard atomic weight A_r, std(Ar)

[7001397920000000000♠39.792, 7001399630000000000♠39.963] conventional: 7001399480000000000♠39.948

Argon in theperiodic cairt

Siller (element)

Mercur (element)

Ne
↑
Ar
↓
Kr

chlorine ←argon →potassium

Atomic nummer(Z)

18

group 18 (noble gases)

Element category

Electron confeeguration

[Ne] 3s² 3p⁶

Electrons per shell

2, 8, 8

Pheesical properties

gas

83.81 K (−189.34 °C, −308.81 °F)

87.302 K (−185.848 °C, −302.526 °F)

Density(at STP)

1.784 g/L

whan liquid (at b.p.)

1.40 g/cm³

83.8058 K, 68.89^[1] kPa

150.687 K, 4.863^[1] MPa

1.18 kJ/mol

Heat o vapourisation

6.43 kJ/mol

Molar heat capacity

5R/2 = 20.786 (C_p) J/(mol·K)

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

Electronegativity

Pauling scale: no data

Ionisation energies

(more)

Covalent radius

Van der Waals radius

188 pm

Colour lines in a spectral range

Spectral lines o argon

Ither properties

Naitural occurrence

Creestal structur

face-centred cubic (fcc)

Face-centered cubic creestal structur for argon

(gas, 27 °C) 323m/s

Thermal conductivity

17.72×10⁻³ W/(m·K)

Magnetic orderin

diamagnetic^[2]

7440–37–1

History

Lord Rayleigh anWilliam Ramsay (1894)

First isolation

Lord Rayleigh an William Ramsay (1894)

Mainisotopes o argon

Isotope	Abundance	Hauf-life(t_1/2)	Decay mode	Product
³⁶Ar	0.337%	-	(β⁺β⁺)	³⁶S
³⁷Ar	syn	35d	ε	³⁷Cl
³⁸Ar	0.063%	stable
³⁹Ar	trace	269 y	β⁻	³⁹K
⁴⁰Ar	99.600%	stable
⁴¹Ar	109.34min	β⁻	⁴¹K
⁴²Ar	32.9y	β⁻	⁴²K

Decay modes in parentheses is predict, but hisna yet been observed

Argon is achemical element wi seembol Ar anatomic nummer 18. It is in group 18 o theperiodic table an is anoble gas. Argon is the third maist common gas in theYird's atmosphere, at 0.93% (9,300 ppm), makin it approximately 23.8 times as abundant as the next maist common atmospheric gas,carbon dioxide (390 ppm), an mair nor 500 times as abundant as the next maist common noble gas,neon (18 ppm). Near aw o this argon isradiogenic argon-40 derived frae thedecay opotassium-40 in the Yird's crust. In the universe,argon-36 is bi far the maist common argonisotope, bein the preferred argon isotope produced bi stellarnucleosynthesis insupernovas.

References

[eedit |eedit soorce]

↑^a ^bHaynes, 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, inLide, D. R., ed. (2005).CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press.ISBN 0-8493-0486-5.

Theperiodic cairt o the elements

Alkaline yird metals

Transeetion elements

Ithernane-metals

Unkent chemical properties

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