Krypton

Krypton, ₃₆Kr
	A krypton-filled dischairge tube glowin white
Krypton
Pronunciation	/ˈkrɪptɒn/ (KRIP-ton)
Appearance	colourless gas, exhibitin a whitish glow in a heich electric field
Standard atomic weight Ar, std(Kr)	83.798(2)
Mass number	Kr:
Krypton in the periodic cairt
	bromine ← krypton → rubidium
Atomic nummer (Z)	36
Group	group 18 (noble gases)
Period	period 4
Block	p-block
Element category	Noble gas
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
whan liquid (at b.p.)	2.413 g/cm3
Treeple pynt	115.775 K, 73.53 kPa
Creetical pynt	209.48 K, 5.525 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)
Atomic properties
Oxidation states	0, +1, +2 (rarely mair nor 0; oxide is unknown)
Electronegativity	Pauling scale: 3.00
Covalent radius	116±4 pm
Van der Waals radius	202 pm
	Spectral lines o krypton
Ither properties
Naitural occurrence	Kr: Primordial
Creestal structur	face-centred cubic (fcc)
Speed o soond	(gas, 23 °C) 220, (liquid) 1120 m/s
Thermal conductivity	9.43×10-3 W/(m·K)
Magnetic orderin	diamagnetic
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
β+	79Br
γ	-
γ	-
	Decay modes in parentheses are predictit, but hae nae yet been observed
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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]

↑ Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.
↑ Krypton. encyclopedia.airliquide.com
↑ ^a ^b Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nt ed.). CRC Press. p. 4.121. ISBN 1439855110.
↑ "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.
↑ 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.

[CIAAW2013-1] Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.

[2] Krypton. encyclopedia.airliquide.com

[b92-3] Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nt ed.). CRC Press. p. 4.121. ISBN 1439855110.

[4] "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.

[5] 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.

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