Krypton

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Krypton,  36Kr
Krypton discharge tube.jpg
Krypton Spectrum.jpg
Spectral lines o krypton
General properties
Name, seembol krypton, Kr
Appearance colourless gas, exhibitin a whitish glow in a heich electric field
Pronunciation /ˈkrɪptɒn/ KRIP-ton
Krypton in the periodic cairt
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline yird metal)
Boron (metalloid)
Carbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oxygen (diatomic nonmetal)
Fluorine (diatomic nonmetal)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline yird metal)
Aluminium (post-transeetion metal)
Silicon (metalloid)
Phosphorus (polyatomic nonmetal)
Sulfur (polyatomic nonmetal)
Chlorine (diatomic nonmetal)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline yird metal)
Scandium (transeetion metal)
Titanium (transeetion metal)
Vanadium (transeetion metal)
Chromium (transeetion metal)
Manganese (transeetion metal)
Airn (transeetion metal)
Cobalt (transeetion metal)
Nickel (transeetion metal)
Capper (transeetion metal)
Zinc (transeetion metal)
Gallium (post-transeetion metal)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (polyatomic nonmetal)
Bromine (diatomic nonmetal)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline yird metal)
Yttrium (transeetion metal)
Zirconium (transeetion metal)
Niobium (transeetion metal)
Molybdenum (transeetion metal)
Technetium (transeetion metal)
Ruthenium (transeetion metal)
Rhodium (transeetion metal)
Palladium (transeetion metal)
Siller (transeetion metal)
Cadmium (transeetion metal)
Indium (post-transeetion metal)
Tin (post-transeetion metal)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (diatomic nonmetal)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline yird metal)
Lanthanum (lanthanide)
Cerium (lanthanide)
Praseodymium (lanthanide)
Neodymium (lanthanide)
Promethium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Dysprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Thulium (lanthanide)
Ytterbium (lanthanide)
Lutetium (lanthanide)
Hafnium (transeetion metal)
Tantalum (transeetion metal)
Tungsten (transeetion metal)
Rhenium (transeetion metal)
Osmium (transeetion metal)
Iridium (transeetion metal)
Platinum (transeetion metal)
Gold (transeetion metal)
Mercur (transeetion metal)
Thallium (post-transeetion metal)
Leid (post-transeetion metal)
Bismuth (post-transeetion metal)
Polonium (post-transeetion metal)
Astatine (metalloid)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline yird metal)
Actinium (actinide)
Thorium (actinide)
Protactinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Americium (actinide)
Curium (actinide)
Berkelium (actinide)
Californium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrencium (actinide)
Rutherfordium (transeetion metal)
Dubnium (transeetion metal)
Seaborgium (transeetion metal)
Bohrium (transeetion metal)
Hassium (transeetion metal)
Meitnerium (unkent chemical properties)
Darmstadtium (unkent chemical properties)
Roentgenium (unkent chemical properties)
Copernicium (transeetion metal)
Ununtrium (unkent chemical properties)
Flerovium (post-transeetion metal)
Ununpentium (unkent chemical properties)
Livermorium (unkent chemical properties)
Ununseptium (unkent chemical properties)
Ununoctium (unkent chemical properties)
Ar

Kr

Xe
brominekryptonrubidium
Atomic nummer (Z) 36
Group, block group 18 (noble gases), p-block
Period period 4
Element category   noble gas
Staundart atomic wicht (Ar) 83.798
Electron configuration [Ar] 3d10 4s2 4p6
per shell
2, 8, 18, 8
Pheesical properties
Phase 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 (0 °C and 101.325 kPa) 3.749 g/L
when liquid, at b.p. 2.413[1] g/cm3
Threeple 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
Miscellanea
Creestal structur face-centred cubic (fcc)
Cubic face-centered crystal 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)
Maist stable isotopes o krypton
iso NA hauf-life DM DE (MeV) DP
78Kr 0.35% >1.1×1020 y (β+β+) 2.846 78Se
79Kr syn 35.04 h ε - 79Br
β+ 0.604 79Br
γ 0.26, 0.39, 0.60 -
80Kr 2.25% 80Kr is stable wi 44 neutrons
81Kr trace 2.29×105 y ε - 81Br
γ 0.281 -
82Kr 11.6% 82Kr is stable wi 46 neutrons
83Kr 11.5% 83Kr is stable wi 47 neutrons
84Kr 57.0% 84Kr is stable wi 48 neutrons
85Kr syn 10.756 y β 0.687 85Rb
86Kr 17.3% - (ββ) 1.2556 86Sr
Decay modes in parentheses are predictit, but hae nae yet been observed
· references

Krypton (frae Greek: κρυπτός kryptos "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.