Th - Thorium

A long halflife radioactive metal, thorium was identified in 1821and isolated by J. J. Berzelius in 1828 in Sweden. Thorium is used in gas lamp mantles and nuclear breeder reactors.

Atomic number - 90 Density g/mL 11 .7

Atomic weight u 232 .03804 Melting point K 2028

Bonding radius A 1 .65 Boiling point K 5061

Atomic radius A - Heat of vaporization kJ/mol 514 .4

Ionization Potential V 6 .08 Heat of fusion kJ/mol 16 .1

Electronegativity - 1 .3 Specific heat J/gK 0 .12

The oxide is a weak base.
Crystal are face centered cubic.

Electron config. : [Rn] 6d² 7s²

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

210
9 msec
a,8.200 MeV
Ra-206
210.0 211
37 msec
a/EC,7.940
Ra-207/Ac-211
211.01481 212
30 msec
a/EC,7.952
Ra-208/Ac-212
212.01291 213
140 msec
a,7.840 MeV
Ra-209
213.01295 214
100 msec
a,7.826 MeV
Ra-210
214.01145 215
1.2 sec
a,7.666 MeV
Ra-211
215.01172 216
0.028 sec
a/EC,8.071
Ra-212/Ac-216
216.01105

216a
180 usec
a,10.099 MeV
Ra-212
216.01322 217
0.252 msec
a,9.424 MeV
Ra-213
217.01306 218
109 nsec
a,9.849 MeV
Ra-214
218.01326 219
1.05 usec
a,9.510 MeV
Ra-215
219.01552 220
9.7 usec
a/EC,8.953
Ra-216/Ac-220
220.01573 221
1.68 msec
a,8.628 MeV
Ra-217
221.01817 222
2.8 msec
a,8.129 MeV
Ra-218
222.01845

223
0.60 sec
a,7.567 MeV
Ra-219
223.02078 224
1.05 sec
a,7.304 MeV
Ra-220
224.02145 225
8.72 min
a/EC,6.922
Ra-221/Ac-225
225.02394 226
30.57 min
a,6.451 MeV
Ra-222
226.02489 227
18.72 da
a,6.146 MeV
Ra-223
227.02769 228
1.9131 yr
a,5.520 MeV
Ra-224
228.02873 229
7880 yr
a,5.168 MeV
Ra-225
229.03175

230
7.538E+4 yr
a/SF,4.770
Ra-226/?
230.03312 231
25.52 hr
a/B-,2.100
Ra-227/Pa-231
231.03629 232 100%
1.405E10 yr
a/SF,4.083
Ra-228/?
232.03804 233
22.3 min
B-,1.245 MeV
Pa-233
233.04157 234
24.10 da
B-,6.420 MeV
Pa-234
234.04359 235
7.1 min
B-,1.930 MeV
Pa-235
235.04750 236
37.5 min
B-,6.000 MeV
Pa-236
236.05014

237
5.0 min
B-,1.710 MeV
Pa-237
237.0 MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

Atomic number	-	90		Density	g/mL	11	.7
Atomic weight	u	232	.03804	Melting point	K	2028
Bonding radius	A	1	.65	Boiling point	K	5061
Atomic radius	A	-		Heat of vaporization	kJ/mol	514	.4
Ionization Potential	V	6	.08	Heat of fusion	kJ/mol	16	.1
Electronegativity	-	1	.3	Specific heat	J/gK	0	.12
The oxide is a weak base.				Crystal are face centered cubic.
Electron config. : [Rn] 6d² 7s²

210 9 msec a,8.200 MeV Ra-206 210.0	211 37 msec a/EC,7.940 Ra-207/Ac-211 211.01481	212 30 msec a/EC,7.952 Ra-208/Ac-212 212.01291	213 140 msec a,7.840 MeV Ra-209 213.01295	214 100 msec a,7.826 MeV Ra-210 214.01145	215 1.2 sec a,7.666 MeV Ra-211 215.01172	216 0.028 sec a/EC,8.071 Ra-212/Ac-216 216.01105
216a 180 usec a,10.099 MeV Ra-212 216.01322	217 0.252 msec a,9.424 MeV Ra-213 217.01306	218 109 nsec a,9.849 MeV Ra-214 218.01326	219 1.05 usec a,9.510 MeV Ra-215 219.01552	220 9.7 usec a/EC,8.953 Ra-216/Ac-220 220.01573	221 1.68 msec a,8.628 MeV Ra-217 221.01817	222 2.8 msec a,8.129 MeV Ra-218 222.01845
223 0.60 sec a,7.567 MeV Ra-219 223.02078	224 1.05 sec a,7.304 MeV Ra-220 224.02145	225 8.72 min a/EC,6.922 Ra-221/Ac-225 225.02394	226 30.57 min a,6.451 MeV Ra-222 226.02489	227 18.72 da a,6.146 MeV Ra-223 227.02769	228 1.9131 yr a,5.520 MeV Ra-224 228.02873	229 7880 yr a,5.168 MeV Ra-225 229.03175
230 7.538E+4 yr a/SF,4.770 Ra-226/? 230.03312	231 25.52 hr a/B-,2.100 Ra-227/Pa-231 231.03629	232 100% 1.405E10 yr a/SF,4.083 Ra-228/? 232.03804	233 22.3 min B-,1.245 MeV Pa-233 233.04157	234 24.10 da B-,6.420 MeV Pa-234 234.04359	235 7.1 min B-,1.930 MeV Pa-235 235.04750	236 37.5 min B-,6.000 MeV Pa-236 236.05014
237 5.0 min B-,1.710 MeV Pa-237 237.0	MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass