Argon, 18 Ar Pronunciation Appearance colorless gas exhibiting a lilac/violet glow when placed in an electric field Standard atomic weight (A r, standard )
Atomic number (Z ) 18 Group , period group n/a , period {{{period}}} Block [[{{{block}}}-block]] Electron configuration {{{electron configuration}}} Electrons per shell
2, 8, 8 Melting point 83.81 K (−189.34 °C, −308.81 °F) Boiling point 87.302 K (−185.848 °C, −302.526 °F) Density (at STP) 1.784 g/L when liquid (at b.p. ) 1.3954 g/cm3 Triple point 83.8058 K, 68.89 kPa[1] Critical point 150.687 K, 4.863 MPa[1] Heat of fusion 1.18 kJ/mol Heat of vaporization 6.53 kJ/mol Molar heat capacity 20.85[2] J/(mol·K) Vapor pressure
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
47
53
61
71
87
Electronegativity Pauling scale: no data Ionization energies 1st: 1520.6 kJ/mol 2nd: 2665.8 kJ/mol 3rd: 3931 kJ/mol (more ) Covalent radius 106±10 pm Van der Waals radius 188 pm Crystal structure face-centered cubic (fcc) Speed of sound 323 m/s (gas, at 27 °C) Thermal conductivity 17.72× 10−3 W/(m·K) Magnetic ordering diamagnetic [3] Magnetic susceptibility −19.6× 10−6 cm3 /mol[4] CAS Number 7440-37-1 Discovery and first isolationLord Rayleigh and William Ramsay (1894)
| references | in Wikidata
ආගන් යනු පරමාණුක ක්රමාංකය 18 වූ මූලද්රව්යයයි. එහි රසායනික සංකේතය Ar ය. ආගන් ඒක පරමාණුක වායුවකි. ආවර්තිතා වගුවේ VIII / 0 (8) කාණ්ඩයේ සිටී. ආගන් උච්ච වායුවකි. ආගන් හි ඉලෙට්රොනික වින්යාසය 2,8,8 වේ. ආවර්තය 3 වන අතර කාන්ඩය VIII / 0 වේ. අයනය නොසාදයි. ප්රධාන සංයුජතාව 0 වේ.
↑ 1.0 1.1 සැකිල්ල:RubberBible92nd
↑ Shuen-Chen Hwang, Robert D. Lein, Daniel A. Morgan (2005). "Noble Gases". Kirk Othmer Encyclopedia of Chemical Technology. Wiley. pp. 343–383. doi:10.1002/0471238961.0701190508230114.a01.
↑ 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
↑ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics . Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4 .