Krypton, 36 General properties Pronunciation Template:Infobox element/pronunciation Appearance colorless gas, exhibiting a whitish glow in an electric field Standard atomic weight (A r, standard ) Template:Infobox element/standard atomic weight Mass number Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)Krypton in the periodic table Template:Infobox element/periodic table Atomic number (Z ) 36 Group Template:Infobox element/group Period period 4 Block p-block Element category Template:Infobox element/category format Electron configuration [Ar ] 3d10 4s2 4p6 Electrons per shell
2, 8, 18, 8 Physical properties Phase at STP gas Melting point 115.78 K (−157.37 °C, −251.27 °F) Boiling point 119.93 K (−153.415 °C, −244.147 °F) Density (at STP) 3.749 g/L when liquid (at b.p. ) 2.413 g/cm3 [1] Triple point 115.775 K, 73.53 kPa[2] [3] Critical point 209.48 K, 5.525 MPa[3] Heat of fusion 1.64 kJ/mol [[Enthalpy of vaporization|Heat of Template:Engvar ]] 9.08 kJ/mol Molar heat capacity 20.95[4] [[Vapor pressure|Template:Engvar pressure Atomic properties Oxidation states Template:Infobox element/symbol-to-oxidation-state Electronegativity Pauling scale: 3.00 [[Ionization energy|Template:Engvar energies]] 1st: 1350.8 kJ/mol 2nd: 2350.4 kJ/mol 3rd: 3565 kJ/mol Covalent radius 116±4 pm Van der Waals radius 202 pm Template:Infobox element/spectral lines Other properties Crystal structure Template:Infobox element/crystal structure Speed of sound (gas, 23 °C) 220 m·s−1 m/s Thermal conductivity 9.43×10−3 W/(m·K) Magnetic ordering diamagnetic [5] Magnetic susceptibility −28.8·10−6 cm3 /mol (298 K)[6] CAS Number 7439-90-9 History Discovery and first isolationWilliam Ramsay and Morris Travers (1898)Main isotopes of krypton Template:Infobox element/isotopes table | references
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↑ Krypton . encyclopedia.airliquide.com↑ "Section 4, Properties of the Elements and Inorganic Compounds; Melting, boiling, triple, and critical temperatures of the elements". CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. 2005. ↑ 3.0 3.1 Template: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 