Tl - Thallium

The toxic heavy metal thallium was discovered in 1861 by Crookes in London.

Atomic number - 81 Density g/mL 11 .85

Atomic weight u 204 .37 Melting point K 577

Bonding radius A 1 .48 Boiling point K 1746

Atomic radius A 2 .08 Heat of vaporization kJ/mol 164 .1

Ionization Potential V 6 .108 Heat of fusion kJ/mol 4 .142

Electronegativity - 2 .04 Specific heat J/gK 0 .13

The oxide is mildly basic.
Crystal are hexagonal.

Electron config. : [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p¹

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

H He

Li Be B C N O F Ne

Na Mg Al Si P S Cl Ar

K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr

Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe

Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn

Fr Ra Ac** Rf Db Sg Bh Hs Mt 110 111 112 113

Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu

Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

Isotopes of Tl: Click mass number for decay process, product for element page.

179
0.16 sec
a,6.860 MeV
Au-175
178.99165 179a
1.4 msec
a,6.860 MeV
Au-175
178.99165 180
1.9 sec
a/EC/ECF,6.258
Au-176/Hg-180/?
179.99023 181
3.4 sec
EC,8.500 MeV
Hg-181
180.98690 182
3.1 sec
a/EC,10.100
Au-178/Hg-182
181.98561 183
6.9 sec
EC,7.600 MeV
Hg-183
182.98260 183a
60 msec
a,6.850 MeV
Au-179
182.98314

184
11 sec
a/EC,9.200
Au-180/Hg-184
183.98174 185
19.5 sec
a/EC,6.600
Au-181/Hg-185
184.97906 186
27.5 sec
a/EC,8.500
Au-182/Hg-186
185.97852 187
51 sec
a/EC,5.900
Au-183/Hg-187
186.97616 188
71 sec
EC,7.800 MeV
Hg-188
187.97592 189
2.3 min
EC,5.180 MeV
Hg-189
188.97369 190
2.6 min
EC,7.000 MeV
Hg-190
189.97380

191

EC,4.490 MeV
Hg-191
190.97188 192
9.6 min
EC,6.120 MeV
Hg-192
191.97214 193
21.6 min
EC,3.640 MeV
Hg-193
192.97055 194
33.0 min
a/EC,5.280
Au-190/Hg-194
193.97105 195
1.16 hr
EC,2.810 MeV
Hg-195
194.96965 196
1.84 hr
EC,4.380 MeV
Hg-196
195.97050 197
2.84 hr
EC,2.180 MeV
Hg-197
196.96953

198
5.3 hr
EC,3.460 MeV
Hg-198
197.97046 199
7.42 hr
EC,1.440 MeV
Hg-199
198.96981 200
26.1 hr
EC,2.456 MeV
Hg-200
199.97094 201
72.912 hr
EC,1.275 MeV
Hg-201
200.97080 202
12.23 da
EC,1.364 MeV
Hg-202
201.97209 203 29.524%

Stable

202.97232 204
3.78 yr
B-/EC,3.800
Pb-204/Hg-204
203.97384

205 70.476%

Stable

204.97441 206
4.199 min
B-,1.533 MeV
Pb-206
205.97609 207
4.77 min
B-,1.423 MeV
Pb-207
206.97740 208
3.053 min
B-,5.001 MeV
Pb-208
207.98200 209
2.20 min
B-,3.980 MeV
Pb-209
208.98534 210
1.30 min
B-/B-n,5.484
Pb-210/Pb-209
209.99006

MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

Updated by clh on 2/6/98. This is not a publication of Phoenix College.

Atomic number	-	81		Density	g/mL	11	.85
Atomic weight	u	204	.37	Melting point	K	577
Bonding radius	A	1	.48	Boiling point	K	1746
Atomic radius	A	2	.08	Heat of vaporization	kJ/mol	164	.1
Ionization Potential	V	6	.108	Heat of fusion	kJ/mol	4	.142
Electronegativity	-	2	.04	Specific heat	J/gK	0	.13
The oxide is mildly basic.				Crystal are hexagonal.
Electron config. : [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p¹
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179 0.16 sec a,6.860 MeV Au-175 178.99165	179a 1.4 msec a,6.860 MeV Au-175 178.99165	180 1.9 sec a/EC/ECF,6.258 Au-176/Hg-180/? 179.99023	181 3.4 sec EC,8.500 MeV Hg-181 180.98690	182 3.1 sec a/EC,10.100 Au-178/Hg-182 181.98561	183 6.9 sec EC,7.600 MeV Hg-183 182.98260	183a 60 msec a,6.850 MeV Au-179 182.98314
184 11 sec a/EC,9.200 Au-180/Hg-184 183.98174	185 19.5 sec a/EC,6.600 Au-181/Hg-185 184.97906	186 27.5 sec a/EC,8.500 Au-182/Hg-186 185.97852	187 51 sec a/EC,5.900 Au-183/Hg-187 186.97616	188 71 sec EC,7.800 MeV Hg-188 187.97592	189 2.3 min EC,5.180 MeV Hg-189 188.97369	190 2.6 min EC,7.000 MeV Hg-190 189.97380
191 EC,4.490 MeV Hg-191 190.97188	192 9.6 min EC,6.120 MeV Hg-192 191.97214	193 21.6 min EC,3.640 MeV Hg-193 192.97055	194 33.0 min a/EC,5.280 Au-190/Hg-194 193.97105	195 1.16 hr EC,2.810 MeV Hg-195 194.96965	196 1.84 hr EC,4.380 MeV Hg-196 195.97050	197 2.84 hr EC,2.180 MeV Hg-197 196.96953
198 5.3 hr EC,3.460 MeV Hg-198 197.97046	199 7.42 hr EC,1.440 MeV Hg-199 198.96981	200 26.1 hr EC,2.456 MeV Hg-200 199.97094	201 72.912 hr EC,1.275 MeV Hg-201 200.97080	202 12.23 da EC,1.364 MeV Hg-202 201.97209	203 29.524% Stable 202.97232	204 3.78 yr B-/EC,3.800 Pb-204/Hg-204 203.97384
205 70.476% Stable 204.97441	206 4.199 min B-,1.533 MeV Pb-206 205.97609	207 4.77 min B-,1.423 MeV Pb-207 206.97740	208 3.053 min B-,5.001 MeV Pb-208 207.98200	209 2.20 min B-,3.980 MeV Pb-209 208.98534	210 1.30 min B-/B-n,5.484 Pb-210/Pb-209 209.99006
MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass