Chemical Elements.com - Astatine (At)

Show Table With:
   Name
   Atomic Number
   Atomic Mass
   Electron Configuration
   Number of Neutrons
   Melting Point
   Boiling Point
   Date of Discovery
   Crystal Structure

Element Groups:
   Alkali Metals
   Alkaline Earth Metals
   Transition Metals
   Other Metals
   Metalloids
   Non-Metals
   Halogens
   Noble Gases
   Rare Earth Elements

Basic Information | Atomic Structure | Isotopes | Related Links | Citing This Page

Basic Information

Name: Astatine
Symbol: At
Atomic Number: 85
Atomic Mass: (210.0) amu
Melting Point: 302.0 °C (575.15 K, 575.6 °F)
Boiling Point: 337.0 °C (610.15 K, 638.6 °F)
Number of Protons/Electrons: 85
Number of Neutrons: 125
Classification: Halogen
Crystal Structure: Unknown
Density @ 293 K: Unknown
Color: Unknown

Atomic Structure

Number of Energy Levels: 6

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

Fifth Energy Level:

Sixth Energy Level:

Isotopes

Isotope	Half Life
At-206	29.4 minutes
At-208	1.6 hours
At-211	7.2 hours
At-215	0.1 milliseconds
At-217	32.0 milliseconds
At-218	1.6 seconds
At-219	50.0 seconds

Facts

Date of Discovery: 1940
Discoverer: D.R. Corson
Name Origin: From the Greek word astatos (unstable)
Uses: No uses known
Obtained From: Man-made

MLA Format for Citing This Page

Bentor, Yinon. Chemical Element.com - Astatine. <http://www.chemicalelements.com/elements/at.html>.

For more information about citing online sources, please visit the MLA's Website.