Periodic Table of the Elements
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Bottom FACULTY OF CHEMICAL TECHNOLOGY o PERIODIC TABLE OF THE ELEMENTS Bottom
  A B C D E F G H I J K L M N O P R S T U V X Z  
Periodic Table of the Elements Tableau périodique des éléments Periodni sustav elemenata Tavola periodica degli elementi Das Periodensystem der Elemente
Astatine Astate Astat Astato Astat

 
Atomic number: 85
Group numbers: 17
Period: 6
 
Discovery date: 1940
At

Astate
NEIGHBOURS
52
Te
 53
I
 54
Xe
84
Po
 85
At
 86
Rn

 
 
 


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Astatine was discovered by Emilio Gino Segrè, Dale R. Corson and K. R. MacKenzie (USA) in 1940. The origin of the name comes from the Greek word astatos meaning unstable. It is unstable, radioactive member of the halogen group.
Bottom HALOGENS ELEMENT Top

Relative atomic mass: [210] Electronic configuration: [Xe] 4f14 5d10 6s2 6p5
Formal oxidation number: Electronegativities: 2.2
Thermal conductivity: 1.7 W m-1 K-1 Electrical resistivity (20 °C): - μΩcm
Atomic radius: 145 pm Standard state (20 °C): solid
Density (g dm-3): - Molar volume (cm3 mol-1): -


Bottom THERMAL PROPERTIES Top

Melting point: 302 °C Heat of fusion: 23.8 kJ mol-1
Boiling point: 337 °C Heat of vaporization: - kJ mol-1
Critical temperature: 787 °C Heat of atomization: 91 kJ mol-1


Bottom IONIZATION ENERGIES AND ABUNDANCE Top

1st ionization energy: - kJ mol-1 Abundance of element (air): - ppm
2nd ionization energy: - kJ mol-1 Abundance of element (Earth's crust): - ppm
3rd ionization energy: - kJ mol-1 Abundance of element (oceans): - ppm


Bottom ISOTOPES Top

Isotopes Relative atomic mass Abundance (%)
210At209.987131(9)*


Bottom MINERALS AND USES Top

Astatine does not occur in nature. Similar to iodine. Produced by bombarding bismuth with alpha particles. Since its isotopes have such short half-lives there are no commercially significant compounds of astatine.

Bottom REDUCTION POTENTIALS Top

Balanced half-reaction   Eo / V      Annotation

 

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