Astatine element (At) is in group 17 and period 6 of a periodic table. Astatine is in the p-block and it is classified as a halogen group element on the periodic table.
There is a lot more information related to astatine which is mentioned in the Information Table given below.
So let’s dive right into it!
Table of contents
- Astatine element (Information Table)
- Astatine element in Periodic table
- Facts about Astatine
- Properties of Astatine
- Uses of Astatine
Astatine Element (Information Table)
The important data related to astatine element is given in the table below.
|Appearance of astatine||Dark gray (predicted)|
|Atomic number of astatine||85|
|Symbol of astatine||At|
|Atomic mass of astatine (most stable isotope)||210 u|
|Protons, Neutrons & Electrons in astatine||Protons: 85, Neutrons: 125, Electrons: 85|
|State of astatine (at STP)||Solid|
|Group number of astatine in periodic table||17|
|Period number of astatine in periodic table||6|
|Block of astatine in periodic table||p-block|
|Category of astatine||Halogen|
|Bohr model or Electrons per shell or Electrons arrangement in astatine||2, 8, 18, 32, 18, 7|
|Electron configuration of astatine||[Xe] 4f14 5d10 6s2 6p5|
|Orbital diagram of astatine|
|Valence electrons in astatine||7|
|Electronegativity of astatine (on pauling scale)||2.2|
|Atomic radius of astatine (van der Waals radius)||202 picometers|
|Density of astatine||no data|
|1st ionization energy of astatine||9.5 eV|
|Main isotope of astatine||210At and 211At|
|Crystal structure of astatine||Face Centered Cubic (FCC)|
|Discovery of astatine||By Emilio Segre, Dale Corson, Kenneth Ross Mackenzie (in 1940)|
Also see: Interactive Periodic Table (It has rotating bohr models as well as many other details of all the 118 elements in a single periodic table).
Astatine element in Periodic table
The Astatine element (At) has the atomic number 85 and is located in group 17 and period 6. Astatine is a nonmetal and it is classified as a halogen element.
Click on above elements in the periodic table to see their information.
Facts about astatine
Here are a few interesting facts about the astatine element.
- Emilio Segre, Dale Corson and Kenneth Ross Mackenzie discovered astatine in the year 1940.
- Astatine was given its name from the Greek word “astatos”, which means unstable.
- The quantity of astatine is very less in the earth’s crust.
- There are around 32 isotopes of astatine and all these isotopes are radioactive in nature.
- 210At is the longest lived isotope of astatine and it has a half life of only 8.3 hours.
Properties of astatine
Here is a list of some physical properties and chemical properties of astatine.
Physical properties of astatine
- Astatine is solid at standard temperature and pressure.
- It has been predicted that astatine has a dark gray appearance.
- The stable isotope of astatine has a predicted atomic mass of 210 amu.
Chemical properties of astatine
- Astatine is a highly radioactive element.
- Astatine reacts with metals to form salts, which is similar to the properties of halogens.
- Astatine is the least reactive halogen and it also has some metallic properties.
- Astatine reacts with water to form hydroastatic acid.
- Astatine forms hydrogen astatide when it reacts with hydrogen gas.
Uses of astatine
Here are some uses of the astatine element.
- Astatine is very reactive and it has a short half-life. So it does not have many applications. It is generally used for research work.
- 211At is the isotope of astatine which can be used to treat cancer.
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- CORSON, D. R., MACKENZIE, K. R., & SEGRÈ, E. (1947, January). Astatine : The Element of Atomic Number 85. Nature, 159(4027), 24–24. https://doi.org/10.1038/159024b0
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- Periodic Table of Elements: Los Alamos National Laboratory. (n.d.). Periodic Table of Elements: Los Alamos National Laboratory. https://periodic.lanl.gov/85.shtml
- Atomic Data for Astatine (At). (n.d.). Atomic Data for Astatine (At). https://physics.nist.gov/PhysRefData/Handbook/Tables/astatinetable1.htm
- Astatine | At | ChemSpider. (n.d.). Astatine | at | ChemSpider. http://www.chemspider.com/Chemical-Structure.4573995.html?rid=b6e70b4c-6eec-4cf0-bb9a-c7ef63a6bf39&page_num=0
- Possolo, et al. (2018, January 4). Interpreting and propagating the uncertainty of the standard atomic weights (IUPAC Technical Report). Pure and Applied Chemistry, 90(2), 395–424. https://doi.org/10.1515/pac-2016-0402
- Emsley, J. (2011). Nature’s Building Blocks: An A-Z Guide to the Elements. United Kingdom: OUP Oxford.
- Haynes, W. M. (Ed.). (2014, June 4). CRC Handbook of Chemistry and Physics. https://doi.org/10.1201/b17118
- Electronic structure of the elements. (2000, March). The European Physical Journal C, 15(1–4), 78–79. https://doi.org/10.1007/bf02683401
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