
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.
H | He | ||||||||||||||||
Li | Be | B | C | N | O | F | Ne | ||||||||||
Na | Mg | Al | Si | P | S | Cl | Ar | ||||||||||
K | Ca | Sc | Ti | V | Cr | Mn | Fe | Co | Ni | Cu | Zn | Ga | Ge | As | Se | Br | Kr |
Rb | Sr | Y | Zr | Nb | Mo | Tc | Ru | Rh | Pd | Ag | Cd | In | Sn | Sb | Te | I | Xe |
Cs | Ba | La* | Hf | Ta | W | Re | Os | Ir | Pt | Au | Hg | Tl | Pb | Bi | Po | At | Rn |
Fr | Ra | Ac** | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og |
*Ce | Pr | Nd | Pm | Sm | Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb | Lu | ||||
**Th | Pa | U | Np | Pu | Am | Cm | Bk | Cf | Es | Fm | Md | No | Lr |
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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