What is the atomic number of radon

radon

Radon: characteristics

Atomic number:

86

Symbol:

Marg

Name (German / English):

Radon (official name according to IUPAC)

Group:

Noble gases

IUPAC group:

18 (old nomenclature: Group VIII A)

Period:

6

Dimensions (approx):

[222,0176] u (no reliable measured value available)

Discoverer:

mandrel

Discovery year:

1900

Occurrence:

arises through natural radioactive decay processes

Frequency:

6,00 · 10-16 % (percentage by mass of the earth's shell, i.e. the earth's crust / oceans up to 16 km depth)

CAS number [1]:

10043-92-2

Radon: atomic properties

Atomic radius (calculated):

120 pm

Covalent radius:

145 pm

Atomic volume:

50.5 cm3/ mol

Ionization energies:

kJ / moleV
1.1037 kJ / mol10.748 eV

Oxidation numbers:

II

Electronegativity (Pauling):

2,2

Electronegativity (Allred / Rochow):

0

Number nat. Isotopes:

4r

Number of stable isotopes:

0

Number of unstable isotopes:

18

Radioactive isotopes:

isotopeHalf-life
222Marg4d (i.e. days, from lt. this)

(The list contains only the most important isotope with a known half-life.)

Electron configuration:

[Xe] 4f145d106s26p6
OrbitalElectrons
1s2
2s2
2p6
3s2
3p6
3d10
4s2
4p6
4d10
4f14
5s2
5p6
5d10
5f0
6s2
6p6
6d0

Shell model:

  • 8 electrons in the outermost occupied shell
  • 18 electrons in the second to last occupied shell
  • 32 electrons in the occupied shell below

Radon: substance properties

Melting point:

202.1 K (~ -71.05 ° C)

Boiling point:

211.3 K (~ -61.85 ° C)

State of aggregation:

gaseous (under normal conditions)

Crystal structure:

Cubic area-centered

Metal properties:

Non-metal (noble gas)

Specific heat of fusion:

2.9 kJ / mol

Specific heat of vaporization:

16.4 kJ / mol

Thermal conductivity:

0.00364 W / m / K

Specific heat capacity:

0.094 J / gK

Specific density:

0.00973 g / cm3
(= 9.73 g / l, under normal conditions)


 
Remarks:
  1. The "CAS Registry Number" is that of the element radon from Chemical Abstracts Service Assigned key number, which makes it easier to find specialist articles about this element in all publications and databases structured according to the CAS system.
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