Xenon 54

Atomic No. Order:

Alphabetic Order:

Periodic Table

2, 8, 18,

18, 8

He
2

Ne
10

Ar
18

Kr
36

Xe
54

Rn
86

Uuo
118

Uho
168

Buo
218

Xenon

Symbol

Atomic Number

54
Noble gas

Relative Atomic Mass
¹²C = 12.0000

131.293(6) [Since 1999]

Atomic Radius pm

130

First Ionisation Energy
kJ mol ^-1

1170.4

First Ionisation Energy (eV)

12,1298

Electronegativity

2.6

Density
kg m ^-3

3540 [s., m.p.]
2939 [l., b.p.]
5.8971 [g., 273 K]

Molar Volume cm ³

37.09 [161 K]

Thermal Conductivity
W m ^-1 K ^-1

0.00569 [300 K]

Melting Point K

161.3

Boiling Point K

166.1

Number of Isotopes

Isotope Atomic mass/u Mole fraction

124Xe 123.905 8954(21) 0.000 952(3)
126Xe 125.904 268(7) 0.000 890(2)
128Xe 127.903 5305(15) 0.019 102(8)
129Xe 128.904 7799(9) 0.264 006(82)
130Xe 129.903 5089(11) 0.040 710(13)
131Xe 130.905 0828(18) 0.212 324(30)
132Xe 131.904 1546(15) 0.269 086(33)
134Xe 133.905 3945(9) 0.104 357(21)
136Xe 135.907 220(8) 0.088 573(44)

Inner + outer Shells

Inner + outer Orbitals

Filling Orbital

5p ⁶

Ground State Electron
Configuration

[Kr]

4d ¹⁰

5p ⁶

= [Xe]

Ground State Electron
Configuration with
free Orbital (n= 0)

0, 0, 0, 0, 0

Ground State Electron
Configuration with
compressed Orbitals (n=56)

0, 0, 0, 14, 42

Singularity

110

	s	p	d	f	g	h	i	j
1	2
2	2	6
3	2	6	10
4	2	6	10	14
5	2	6	10	14	18
6
7
8

Term Symbol

¹S ₀

Discovery

It was discovered by the Scottish chemist
William Ramsay and the English chemist Morris William Travers (London, England) in 1898 in a liquefied air sample.
The atomic weight of Xe is based on analyses of Xe separated from air.

Name Derived From

The name derives from the Greek xenos for "the stranger".

APSIDIUM	Created:		2002-07-20		054.pdf
	Page update:		2004-06-20		054.pdf