Elements of the periodic table

Elements of the periodic table

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Kr (krypton)

Tab. 1: krypton

Name of the element:	krypton
Latin name:	krypton
English name:	krypton
French name:	krypton
Symbol:	Kr
Atomic number:	36
Condition at 25 $° C$ :	gaseous, non-metal
Frequency (in $ppm$ ):	0.00001
Discovered by:	Ramsay and Travers (1898)
Electron configuration:	$[Ar] 3 d^{10} 4 s^{2} 4 p^{6}$
Oxidation states:	+2, +4
Relative atomic mass:	83.80
Electronegativity:	not known
Atomic radius (in $pm$ ):	198
Ionization energy (in $eV {atom}^{-1}$ ):	13.999
Density (in $kg m^{-3}$ ):	3.7493
Melting temperature (in $K$ ):	116.6
Boiling temperature (in $K$ ):	120.85

Tab. 2: Isotopes of Krypton

Mass number	Atomic mass	Frequency /%	Nuclear spin
$78$	$77.9204$	$0.35$	$0$
$80$	$79.9164$	$2.25$	$0$
$82$	$81.9135$	$11.60$	$0$
$83$	$82.9141$	$11.50$	$+ \frac{9}{2}$
$84$	$83.9115$	$57.00$	$0$
$85^{*}$	$84.9115$	$0$	$+ \frac{9}{2}$
$86$	$85.9106$	$17.30$	$0$

$^{*}$ Isotope is not stable and decays

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