Astatine

Symbol AtAtomic number 85...
Atomic mass
210
 Thermal conductivity
0.017
Atomic radius
1.43
 Covalent radius
1.45
Density
...
 Atomic volume
...
Melting point
575
 Oxidation states
+/-1,3,5,7
Boiling point
610
 Stable isotopes
0
Heat of vapor.
...
 Electronegativity
2.2
Heat of fusion
...
 First ionization
...
Specific heat
...
 Electrical conduct.
...
Electron configuration

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Astatine

Astatine is a halogen which has no stable isotopes. It was prepared in 1940 by bombarding bismuth with high-energy alpha particles (helium ions). The first isotope synthesized was At-211 which has a half-life of 7.2 hr. At-210 was produced and found to have a half-life of about 8.3 hr.

Astatine has the most metallic-like properties of any of the halogens.

Astatine is highly carcinogenic: Mammary and pituitary tumors have been induced in laboratory animals by a single injection.

Atomic dataNuclear data
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Periodic Table

Chemistry concepts

Reference
Pauling
 
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Astatine Nuclear Data

Z
A
Atomic
Mass (u)
Nuclear
Mass(GeV/c2)
Binding
Energy(MeV)
Spin
Natural
Abund.
Half-life
Decay
Q
MeV
85
207
206.985733
192.7641
1617.6
9/2
...
1.81h
b+,a
3.88,5.87
85
210
209.987126
195.5599
1640.5
5
...
8.1h
EC,a
3.98,5.63
85
211
210.987470
196.4917
1648.2
9/2
...
7.21h
EC,a
0.78,5.98
85
213
212.992911
198.3598
1659.3
9/2
...
0.11ms
a
9.25
85
215
214.998638
200.2281
1670.1
9/2
...
0.1ms
a
8.18
85
217
217.004695
202.0968
1680.6
9/2
...
32.3ms
a
7.20
Atomic data
Index

Periodic Table

Chemistry concepts

Reference
Rohlf
 
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