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Te
52
I
53
Xe
54
Po
84
At
85
Rn
86
Lv
116
Uus
117
Uuo
118

 

Periodic table

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Astat

en  English

Astatine

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Astate

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Astat

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Astato

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Astato

 

At
At
Astate

PERIODIC TABLE OF THE ELEMENTS

ASTATINE

HALOGENS ELEMENT

 

Atomic number:85

Group numbers:17

Period:6

Electronic configuration:[Xe] 4f14 5d10 6s2 6p5

Formal oxidation number:

Electronegativities:2.2

Atomic radius / pm:145

Relative atomic mass:[210]

 

Astatine was discovered by Emilio Segré, Dale Raymond Corson, and Kenneth Ross Mackenzie (US) in 1940. The origin of the name comes from the Greek word astatos meaning unstable. It is a unstable, radioactive member of the halogen group. Astatine does not occur in nature, it is similar to iodine. Astatine is produced by bombarding bismuth with alpha particles. Since its isotopes have such short half-lives there are no commercially significant compounds of astatine.

PHYSICAL PROPERTIES

Density / g dm-3:-

Molar volume / cm3mol-1:-

Electrical resistivity / μΩcm:- (20 °C)

THERMAL PROPERTIES

Thermal conductivity / W m-1K-1:1.7

Melting point / °C:302

Boiling point / °C:337

Heat of fusion / kJ mol-1:23.8

Heat of vaporization / kJ mol-1:-

Heat of atomization / kJ mol-1:91

IONIZATION ENERGIES

First ionization energy / kJ mol-1:-

Second ionization energy / kJ mol-1:-

Third ionization energy / kJ mol-1:-

ABUNDANCE OF ELEMENTS

in the atmosphere / ppm:-

in the Earth's crust / ppm:-

in the oceans / ppm:-

CRYSTALLOGRAPHIC DATA

 -

Crystal structure:

-

Unit-cell dimensions / pm:

-

Space group:

-

ISOTOPES

IsotopeRelative atomic massMass percent (%)
210At209.987131(9)*

REDUCTION POTENTIALS

Balanced half-reaction Eo / V

 

84 Polonium <=
85 Astatine
=> 86 Radon