Mendeleev's Periodic Table > Po - Polonium

Po - Polonium

Polonium was discovered by Marie Curie in 1898 in Paris. Polonium has more isotopes than any other element, all of which are radioactive. Polonium dissolves readily in dilute acids, but is only slightly soluble in alkalis. The element is highly toxic. Polonium has been found in tobacco as a contaminant and in uranium ores.

Atomic number - 84 Density g/mL 9 .4
Atomic weight u 209 Melting point K 527
Bonding radius A 1 .46 Boiling point K 1235
Atomic radius A 1 .53 Heat of vaporization kJ/mol -
Ionization Potential V 8 .42 Heat of fusion kJ/mol -
Electronegativity - 2 Specific heat J/gK -
The oxide is amphoteric. Crystal are monoclinic.
Electron config. : [Xe] 4f14 5d10 6s2 6p4

Isotopes of Po(Polonium):

MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 190
9.6 msec
a,7.643 MeV
Pb-186
189.99506 		191
15.5 msec
a,7.471 MeV
Pb-187
190.99452 		192
0.034 sec
a/EC,7.320
Pb-188/Bi-192
191.99151 		193
360 msec
a,7.100 MeV
Pb-189
192.99108
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 194
0.392 sec
a,6.987 MeV
Pb-190
193.98828 		195
4.64 sec
a/EC,6.750
Pb-191/Bi-195
194.98804 		196
5.8 sec
a/EC,6.657
Pb-192/Bi-196
195.98551 		197
53.6 sec
a/EC,6.200
Pb-193/Bi-197
196.98557
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 198
1.76 min
a/EC,6.309
Pb-194/Bi-198
197.98333 		199
5.48 min
a/EC,5.600
Pb-195/Bi-199
198.98357 		200
11.5 min
a/EC,3.350
Pb-196/Bi-200
199.98173 		201
15.3 min
a/EC,4.880
Pb-197/Bi-201
200.98221
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 202
44.7 min
a/EC,2.820
Pb-198/Bi-202
201.98069 		203
36.7 min
a/EC,4.230
Pb-199/Bi-203
202.98141 		204
3.53 hr
a/EC,2.340
Pb-200/Bi-204
203.98030 		205
1.66 hr
a/EC,3.530
Pb-201/Bi-205
204.98117
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 206
8.8 da
a/EC,1.846
Pb-202/Bi-206
205.98046 		207
5.80 hr
a/EC,2.909
Pb-203/Bi-207
206.98157 		208
2.898 yr
a/EC,5.215
Pb-204/Bi-208
207.98123 		209
102 yr
a/EC,4.979
Pb-205/Bi-209
208.98241
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 210
138.376 da
a,5.407 MeV
Pb-206
209.98285 		211
0.516 sec
a,7.595 MeV
Pb-207
210.98663 		212
0.299 usec
a,8.954 MeV
Pb-208
211.98885 		212a
45.1 sec
a,11.876 MeV
Pb-208
211.99198
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 213
4.2 usec
a,8.537 MeV
Pb-209
212.99284 		214
164.3 usec
a,7.833 MeV
Pb-210
213.99518 		215
1.781 msec
a/B-,7.526
Pb-211/At-215
214.99941 		216
0.145 sec
a,6.906 MeV
Pb-212
216.00190
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 217
10 sec
a/B-,6.660
Pb-213/At-217
217.00634 		218
3.10 min
a/B-,6.115
Pb-214/At-218
218.00896