Cm - Curium

There is no curium in our lab. Discovereded by Seaborg, James and Ghiorso in 1944.

Atomic number - 96 Density g/mL 13 .511

Atomic weight u 247 Melting point K 1613

Bonding radius A - Boiling point K -

Atomic radius A - Heat of vaporization kJ/mol -

Ionization Potential V 6 .02 Heat of fusion kJ/mol 15

Electronegativity - 1 .3 Specific heat J/gK -

The oxide is amphoteric.
Crystal are unknown.

Electron config. : [Rn] 5f⁷ 6d¹ 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 Cm: Click mass number for decay process, product for element page.

232
1 min
SF,7.100 MeV
?
232.0 236

a/EC,7.100
Pu-232/Am-236
236.05140 238
2.4 hr
a/EC,6.040
Pu-234/Am-238
238.05301 239
2.9 hr
a/EC,1.700
Pu-235/Am-239
239.05484 240
27 da
a/EC/SF,6.397
Pu-236/Am-240/?
240.05551 240a
55 nsec
SF,6.397 MeV
?
240.05874 241
32.8 da
a/EC,5.638
Pu-237/Am-241
241.05764

242
162.8 da
a/SF,6.216
Pu-238/?
242.05882 242a
180 nsec
SF,6.216 MeV
?
242.06183 243
29.1 yr
a/EC/SF,6.169
Pu-239/Am-243/?
243.06138 244
18.10 yr
a/SF,5.902
Pu-240/?
244.06274 244a
34 msec
SF,5.902 MeV
?
244.06386 245
8500 yr
a/SF,5.623
Pu-241/?
245.06548 246
4730 yr
a/SF,5.475
Pu-242/?
246.06721

247
1.56E+7 yr
a,5.353 MeV
Pu-243
247.07034 248
3.40E+5 yr
a/SF,5.162
Pu-244/?
248.07234 249
64.15 min
B-,8.700 MeV
Bk-249
249.07594 250
9700 yr
a/B-/SF,3.700
Pu-246/Bk-250/?
250.07834 251
16.8 min
B-,1.420 MeV
Bk-251
251.08227 252
2 da
B-,3.780 MeV
Bk-252
252.0

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	-	96		Density	g/mL	13	.511
Atomic weight	u	247		Melting point	K	1613
Bonding radius	A	-		Boiling point	K	-
Atomic radius	A	-		Heat of vaporization	kJ/mol	-
Ionization Potential	V	6	.02	Heat of fusion	kJ/mol	15
Electronegativity	-	1	.3	Specific heat	J/gK	-
The oxide is amphoteric.				Crystal are unknown.
Electron config. : [Rn] 5f⁷ 6d¹ 7s²
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232 1 min SF,7.100 MeV ? 232.0	236 a/EC,7.100 Pu-232/Am-236 236.05140	238 2.4 hr a/EC,6.040 Pu-234/Am-238 238.05301	239 2.9 hr a/EC,1.700 Pu-235/Am-239 239.05484	240 27 da a/EC/SF,6.397 Pu-236/Am-240/? 240.05551	240a 55 nsec SF,6.397 MeV ? 240.05874	241 32.8 da a/EC,5.638 Pu-237/Am-241 241.05764
242 162.8 da a/SF,6.216 Pu-238/? 242.05882	242a 180 nsec SF,6.216 MeV ? 242.06183	243 29.1 yr a/EC/SF,6.169 Pu-239/Am-243/? 243.06138	244 18.10 yr a/SF,5.902 Pu-240/? 244.06274	244a 34 msec SF,5.902 MeV ? 244.06386	245 8500 yr a/SF,5.623 Pu-241/? 245.06548	246 4730 yr a/SF,5.475 Pu-242/? 246.06721
247 1.56E+7 yr a,5.353 MeV Pu-243 247.07034	248 3.40E+5 yr a/SF,5.162 Pu-244/? 248.07234	249 64.15 min B-,8.700 MeV Bk-249 249.07594	250 9700 yr a/B-/SF,3.700 Pu-246/Bk-250/? 250.07834	251 16.8 min B-,1.420 MeV Bk-251 251.08227	252 2 da B-,3.780 MeV Bk-252 252.0
MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass