Krypton

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Krypton,  36Kr
Krypton discharge tube.jpg
A krypton-filled discharge tube glowing white
General properties
Appearance colourless gas, exhibitin a whitish glow in a heich electric field
Staundart atomic wecht (Ar, staundart) 83.798(2)
Krypton in the periodic cairt
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercur (element) Thallium Leid (element) Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium
Ar

Kr

Xe
brominekryptonrubidium
Atomic nummer (Z) 36
Group group 18 (noble gases)
Period period 4
Element category   noble gas
Block p-block
Electron confeeguration [Ar] 3d10 4s2 4p6
Electrons per shell
2, 8, 18, 8
Pheesical properties
Phase (at STP) gas
Meltin pynt 115.78 K ​(-157.37 °C, ​-251.27 °F)
Bylin pynt 119.93 K ​(-153.415 °C, ​-244.147 °F)
Density (at STP) 3.749 g/L
when liquid (at b.p.) 2.413[1] g/cm3
Treeple pynt 115.775 K, ​73.53[2] kPa [3]
Creetical pynt 209.48 K, 5.525[2] MPa
Heat o fusion 1.64 kJ/mol
Heat o vapourisation 9.08 kJ/mol
Molar heat capacity 5R/2 = 20.786 J/(mol·K)
Vapour pressur
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 59 65 74 84 99 120
Atomic properties
Oxidation states 2, 1, 0
Electronegativity Pauling scale: 3.00
Covalent radius 116±4 pm
Van der Waals radius 202 pm
Color lines in a spectral range
Miscellanea
Creestal structurface-centred cubic (fcc)
Cubic face-centered creestal structur for krypton
Speed o soond (gas, 23 °C) 220, (liquid) 1120 m/s
Thermal conductivity 9.43×10-3  W/(m·K)
Magnetic orderin diamagnetic[4]
CAS Nummer 7439-90-9
History
Diskivery William Ramsay an Morris Travers (1898)
First isolation William Ramsay an Morris Travers (1898)
Main isotopes o krypton
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
78Kr 0.35% >1.1×1020 y (β+β+) 78Se 79Kr syn 35.04 h ε 79Br
β+ 79Br
γ -
80Kr 2.25% stable
81Kr trace 2.29×105 y ε 81Br
γ -
82Kr 11.6% stable
83Kr 11.5% stable
84Kr 57.0% stable
85Kr syn 10.756 y β 85Rb
86Kr 17.3% - (ββ) 86Sr
Decay modes in parentheses are predictit, but hae nae yet been observed
| references | in Wikidata

Krypton (frae [κρυπτός kryptos] error: {{lang-xx}}: text has italic markup (help) "the hidden ane") is a chemical element wi seembol Kr an atomic nummer 36. It is a member o group 18 (noble gases) elements. A colourless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere, is isolatit bi fractionally distillin liquified air, an is eften uised wi ither rare gases in fluorescent lamps. Krypton is inert for maist practical purposes.

References[eedit | eedit soorce]

  1. Krypton. encyclopedia.airliquide.com
  2. 2.0 2.1 Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nt ed.). CRC Press. p. 4.121. ISBN 1439855110. 
  3. "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. 
  4. 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.