Elements
85

At

Astatine

Astatine (At) is a radioactive non-metal that has the atomic number 85 in the periodic table in Group 17. It has the symbol At.

Astatine is classed as a halogen and a non metal. It was predicted to exist by Mendeleev and he called it eka-iodine. Astatine however could not be found in nature but was made in the lab in 1940. It was made by Dale Coson, Kenneth Ross Mackenzie and Emilio Segrè by bombarding bismuth with alpha particles. It is very unstable and breaks down quickly. Its uses are in cancer treatment and as a tracer due to its very short half life. It is a solid non metal at room temperature with a melting point of 302°c and a boiling point of 336°c. Astatine like Iodine can be absorbed by the thyroid, in animal studies due to its radioactivity it was discovered that this causes greater damage that iodine due to astatine being easily absorbed by animal thyroids.

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FAQ's

What is the Melting Point for Astatine?

Astatine has a Melting Point of 302°F, meaning at 302°F it will turn to a liquid.

What is the Boiling Point for Astatine?

Astatine has a Boiling Point of 337°F, meaning at 337°F it will turn to a Gas.

What is the Electronegativity of Astatine?

Astatine's Electronegativty is 2.2. Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.

What is the Heat of Vaporization of Astatine?

Astatine has a Heat of Vaporization of kJ/mol.

Uses

Since its isotopes have such short half-lives there are no commercially significant compounds of astatine.

Sources

Does not occur in nature. Similar to iodine. Produced by bombarding bismuth with alpha particles.

85
Protons
85
Electrons
125
Neutrons

At

Element Symbol
At
Atomic Weight
210
Atomic Number
85
State
Solid
Melting Point
Unknown
302
°C
Boiling Point
337
Unknown
°C
Heat of Vaporization
Unknown
kJ/mol
Crystal Structure
Unknown
Thermoconductivity
0.017
Unknown
W/cmK
Shells
2,8,18,32,18,7
Group
Halogen
Period
6
Block
P Block
Orbitals
[Xe] 4f14 5d10 6s2 6p5
Coefficient of Thermal Expansion
--
Covalent Radius
1.45 Å
Density at 293K
--
Electrical Conductivity
--
First Ionization Potential
9.5 V
Second Ionization Potential
--
Third Ionization Potential
--
Ionic Radius
--
Oxydation States
(±1),3,5,7
Lattice Parameter
--
Lattice Parameter 2
--
Lattice Parameter 3
--
Pronounced

AS-teh-teen

Discovered by

D.R.Corson, K.R.MacKenzie, E.Segré

Discovery date

1940

Orbital configuration
2,8,18,32,18,7

Download the Periodic Table

Explore Other Halogens

35.453
17

Cl

Chlorine
126.904
53

I

Iodine
79.904
35

Br

Bromine
18.998
9

F

Fluorine
The halogens are located in group 17 (formally known as group VIIA) on the left of the noble gases on the periodic table. These five toxic, non-metallic elements make up group 17 and consist of: fluorine (F), chlorine (Cl), bromine (Br), iodine (I) and astatine (As).
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