![[ATOM]](atom.gif) |
Astatine
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Information valid for At-210 unless otherwise noted
Basic Information
Symbol: At
Atomic Number: 85
Mass: (210.0)
Melting Point: 302.0 C
Boiling Point: 337.0 C
Number of Protons/Electrons: 85
Number of Neutrons: 125
Classification: Halogen
Crystal Structure: Unknown
Density @ 293 K: Unknown
Color: Unknown
Atomic Structure
![[Bohr Model of Astatine]](b0085.gif) |
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Number of Energy Levels: 6
First Energy Level: 2
Second Energy Level: 8
Third Energy Level: 18
Fourth Energy Level: 32
Fifth Energy Level: 18
Sixth Energy Level: 7
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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