Periodic Table Group and Classification of the of the Astatine Element
Elements can be classified based on their physical states (States of Matter) e.g. gas, solid or liquid. This element is a solid. Astatine is classified as an element in the 'Halogens' section which can be located in group 7 of the Periodic Table. The term "halogen" means "salt-former" and compounds containing halogens are called "salts". The halogens exist, at room temperature, in all three states of matter - Gases such as Fluorine & Chlorine, Solids such as Iodine and Astatine and Liquid as in Bromine.

Facts about the Discovery and History of the Astatine Element
Astatine was discovered in University of California, Berkeley, USA  by Dale R. Corson, K. R. MacKenzie, and Emilio Segre in 1940.

History of the Periodic Table
Check out the brief History of the Periodic Table which details dates and the names of famous scientists and chemists who contributed to the development of the Periodic Table.

Occurrence of the Astatine Element
% in Universe N/A
% in Sun N/A
% in Meteorites None
% in Earth's Crust None
% in Oceans None
% in Humans None

The Properties of the Astatine Element
Name of Element : Astatine
Symbol of Element : At
Atomic Number of Astatine : 85
Atomic Mass: (210.0) amu
Melting Point: 302.0 °C - 575.15 °K
Boiling Point: 337.0 °C - 610.15 °K
Number of Protons/Electrons in Astatine : 85
Number of Neutrons in Astatine : 125
Crystal Structure: Unknown
Density Unknown
Color of Astatine : Unknown

Astatine as on the Periodic Table
Check out Astatine on the Periodic Table which arranges each chemical element according to its atomic number, as based on the Periodic Law, so that chemical elements with similar properties are in the same column. Our Periodic Table is simple to use - just click on the symbol for Astatine as on the Periodic Table for additional information and for an instant comparison of the Atomic Weight, Melting Point, Boiling Point and Mass - G/cc with any other element. An invaluable source of facts and information as a Chemistry reference guide.

Other elements classified as Halogens
The other elements contained in this classification are as follows:

• Fluorine
• Chlorine
• Bromine
• Iodine

What is Astatine - IUPAC and the Modern Standardised Periodic Table
The Standardised Periodic Table in use today was agreed by the International Union of Pure Applied Chemistry, IUPAC, in 1985 and now recognises more periods and elements than Dimitri  Mendeleev knew in his day in his day but still all fitting into his concept of  the "Periodic Table" in which Astatine is just one element that can be found.

Learn about what is Astatine with these fast facts...
These articles contain facts and information relating to Astatine and each of the other elements including the Periodic Symbol,  group, classification, properties and atomic number which is often referred to as the Periodic Table Number. Test your knowledge of chemistry and the Periodic Table by completing the Element Symbols and Atomic Numbers on our Blank Periodic Table. Chemistry students will also find a helpful section on Chemical Formulas.