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

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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 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

Updated by clh on 2/6/98. This is not a publication of Phoenix College.

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
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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