Am - Americium

A tiny amount of americium provides electrons in our smoke detectors. It was discovered by Glenn Seaborg in 1944 in Berkeley.

Atomic number - 95 Density g/mL 13 .6
Atomic weight u 243 Melting point K 1268
Bonding radius A - Boiling point K 2880
Atomic radius A - Heat of vaporization kJ/mol -
Ionization Potential V 5 .993 Heat of fusion kJ/mol 14 .4
Electronegativity - 1 .3 Specific heat J/gK 0 .11
The oxide is amphoteric.
Crystal are hexagonal.

Electron config. : [Rn] 5f7 7s2


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


232
79 sec
a/EC,6.716
Np-228/Pu-232
232.04663
234
2.32 min
a/EC,4.170
Np-230/Pu-234
234.04778
236

a/EC,6.450
Np-232/Pu-236
236.04956
237
73.0 min
a/EC,1.730
Np-233/Pu-237
237.05026
237a
5 nsec
SF,6.250 MeV
?
237.05283
238
98 min
a/EC,2.260
Np-234/Pu-238
238.05198
239
11.9 hr
a/EC,5.245
Np-235/Pu-239
239.05301
240
50.8 hr
a/EC,1.379
Np-236/Pu-240
240.05528
240a
0.942 msec
SF,5.710 MeV
?
240.05850
241
432.2 yr
a/SF,5.638
Np-237/?
241.05682
241a
1.2 usec
SF,5.638 MeV
?
241.05918
242
16.02 hr
B-/EC,4.984
Cm-242/Pu-242
242.05954
242a
14.0 msec
a,7.788 MeV
Np-238
242.06190
243
7370 yr
a/SF,5.438
Np-239/?
243.06137
244
10.1 hr
B-/EC,1.428
Cm-244/Pu-244
244.06427
244a
0.90 msec
SF,1.428 MeV
?
244.06427
245
2.05 hr
B-,1.205 MeV
Cm-245
245.06644
246
39 min
B-,2.376 MeV
Cm-246
246.06976
247
23.0 min
B-,1.700 MeV
Cm-247
247.07217
248

B-,3.100 MeV
Cm-248
248.07567
MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass