Mendeleev's Periodic Table > At - Astatine

At - Astatine

Astatine was discovered by Corson, etal., in 1940. The longest-lived isotope, 210At, has a half-life of only 8.3 hours. There are about 20 isotopes known, all of which are radioactive. Astatine is a halogen and possibly accumulates in the thyroid like iodine.

Atomic number - 85 Density g/mL -
Atomic weight u 210 Melting point K 575
Bonding radius A 1 .45 Boiling point K 610
Atomic radius A 1 .43 Heat of vaporization kJ/mol -
Ionization Potential V - Heat of fusion kJ/mol -
Electronegativity - 2 .2 Specific heat J/gK -
The oxide is unknown. Crystal are unknown.
Electron config. : [Xe] 4f14 5d10 6s2 6p5

Isotopes of At (Astatine):

MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 194
40 msec
a,7.310 MeV
Bi-190
193.99892 		195

a/EC,7.400
Bi-191/Po-195
194.99656 		196
0.3 sec
a,7.200 MeV
Bi-192
195.99570 		197
0.35 sec
a/EC,7.100
Bi-193/Po-197
196.99323
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 198
4.2 sec
a/EC,6.893
Bi-194/Po-198
197.99280 		199
7.2 sec
a/EC,6.780
Bi-195/Po-199
198.99062 		200
43 sec
a/EC,6.596
Bi-196/Po-200
199.99029 		201
89 sec
a/EC,6.473
Bi-197/Po-201
200.98849
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 202
184 sec
a/EC,7.210
Bi-198/Po-202
201.98844 		203
7.4 min
a/EC,5.060
Bi-199/Po-203
202.98683 		204
9.2 min
a/EC,6.480
Bi-200/Po-204
203.98725 		205
26.2 min
a/EC,4.540
Bi-201/Po-205
204.98603
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 206
30.0 min
a/EC,5.720
Bi-202/Po-206
205.98660 		207
1.80 hr
a/EC,3.910
Bi-203/Po-207
206.98577 		208
1.63 hr
a/EC,4.973
Bi-204/Po-208
207.98656 		209
5.41 hr
a/EC,3.486
Bi-205/Po-209
208.98615
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 210
8.1 hr
a/EC,3.981
Bi-206/Po-210
209.98713 		211
7.214 hr
a/EC,5.982
Bi-207/Po-211
210.98748 		212
0.314 sec
a/B-/EC,7.829
Bi-208/Rn-212/Po-212
211.99073 		213
125 nsec
a,9.254 MeV
Bi-209
212.99292
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 214
558 nsec
a,8.987 MeV
Bi-210
213.99635 		215
0.10 msec
a,8.178 MeV
Bi-211
214.99864 		216
0.30 msec
a/B-/EC,7.949
Bi-212/Rn-216/Po-216
216.00240 		217
32.3 msec
a/B-,7.202
Bi-213/Rn-217
217.00470
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 218
1.5 sec
a/B-,6.874
Bi-214/Rn-218
218.00868 		219
56 sec
a/B-,6.390
Bi-215/Rn-219
219.01129 		220
3.71 min
a/B-,3.650
Bi-216/Rn-220
220.01529 		221
2.3 min
B-,6.405 MeV
Rn-221
221.01789
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 222
54 sec
B-,4.400 MeV
Rn-222
222.02232 		223
50 sec
B-,5.590 MeV
Rn-223
223.02511


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