U.S. Army photograph

Pu - Plutonium

Plutonium was discovered, secretly, in 1940 by Glenn Seaborg with Wahl and Kennedy at Berkeley and publicly reported in 1946. Plutonium was extracted from uranium ore in 1947. Until recently the major use of plutonium has been for nuclear weaponry, it now finds its best use in deep space probe electricity sources .

Atomic number - 94 Density g/mL 19 .8

Atomic weight u 244 Melting point K 913

Bonding radius A - Boiling point K 3503

Atomic radius A - Heat of vaporization kJ/mol 344

Ionization Potential V 6 .06 Heat of fusion kJ/mol 2 .84

Electronegativity - 1 .28 Specific heat J/gK 0 .13

The oxide is amphoteric.
Crystal are monoclinic.

Electron config. : [Rn] 5f⁶ 7s²

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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 Pu: Click mass number for decay process, product for element page.

228

a/SF,4.480
U-224/?
228.0 229

a,2.560 MeV
U-225
229.0 230
200 sec
a,7.175 MeV
U-226
230.03963 232
34.1 min
a/EC,1.060
U-228/Np-232
232.04117 233
20.9 min
a/EC,1.900
U-229/Np-233
233.04299 234
8.8 hr
a/EC,1.810
U-230/Np-234
234.04330 235
25.3 min
a/EC,1.170
U-231/Np-235
235.04530

236
2.858 yr
a/SF,5.867
U-232/?
236.04604 237
45.2 da
a/EC,4.959
U-233/Np-237
237.04840 237a
1.1 usec
SF,5.750 MeV
?
237.05151 238
87.7 yr
a/SF,5.593
U-234/?
238.04955 238a
6.0 nsec
SF,5.593 MeV
?
238.05331 239
24110 yr
a/SF,5.245
U-235/?
239.05215 240
6564 yr
a/SF,5.256
U-236/?
240.05380

240a
3.7 nsec
SF,5.256 MeV
?
240.05681 241
14.35 yr
a/B-/SF,1.310
U-237/Am-241/?
241.05684 241a
32 nsec
SF,5.140 MeV
?
241.05920 242
3.733E+5 yr
a/SF,4.984
U-238/?
242.05873 243
4.956 hr
B-,2.170 MeV
Am-243
243.06199 244
8.08E+7 yr
a/SF,4.666
U-240/?
244.06419 245
10.5 hr
B-,1.205 MeV
Am-245
245.06773

246
10.84 da
B-,8.440 MeV
Am-246
246.07019 247
2.27 da
B-,2.160 MeV
Am-247
247.07450 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	-	94		Density	g/mL	19	.8
Atomic weight	u	244		Melting point	K	913
Bonding radius	A	-		Boiling point	K	3503
Atomic radius	A	-		Heat of vaporization	kJ/mol	344
Ionization Potential	V	6	.06	Heat of fusion	kJ/mol	2	.84
Electronegativity	-	1	.28	Specific heat	J/gK	0	.13
The oxide is amphoteric.				Crystal are monoclinic.
Electron config. : [Rn] 5f⁶ 7s²
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228 a/SF,4.480 U-224/? 228.0	229 a,2.560 MeV U-225 229.0	230 200 sec a,7.175 MeV U-226 230.03963	232 34.1 min a/EC,1.060 U-228/Np-232 232.04117	233 20.9 min a/EC,1.900 U-229/Np-233 233.04299	234 8.8 hr a/EC,1.810 U-230/Np-234 234.04330	235 25.3 min a/EC,1.170 U-231/Np-235 235.04530
236 2.858 yr a/SF,5.867 U-232/? 236.04604	237 45.2 da a/EC,4.959 U-233/Np-237 237.04840	237a 1.1 usec SF,5.750 MeV ? 237.05151	238 87.7 yr a/SF,5.593 U-234/? 238.04955	238a 6.0 nsec SF,5.593 MeV ? 238.05331	239 24110 yr a/SF,5.245 U-235/? 239.05215	240 6564 yr a/SF,5.256 U-236/? 240.05380
240a 3.7 nsec SF,5.256 MeV ? 240.05681	241 14.35 yr a/B-/SF,1.310 U-237/Am-241/? 241.05684	241a 32 nsec SF,5.140 MeV ? 241.05920	242 3.733E+5 yr a/SF,4.984 U-238/? 242.05873	243 4.956 hr B-,2.170 MeV Am-243 243.06199	244 8.08E+7 yr a/SF,4.666 U-240/? 244.06419	245 10.5 hr B-,1.205 MeV Am-245 245.06773
246 10.84 da B-,8.440 MeV Am-246 246.07019	247 2.27 da B-,2.160 MeV Am-247 247.07450	MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass