Ang amerisyo (Iningles americium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Am ug kaiphan nga atomik 95. Ang amerisyo mao ang aktinido.
Quick Facts Americium, Panagway ...
| Americium |
|---|
95Am |
|
|
| Panagway |
silvery white
 |
| Kinatibuk-ang mga kinaiya |
| Ngalan, simbolo, kaiphan |
americium, Am, 95 |
| Paglitok |
[[Help:Pronunciation respelling key|Plantilya:Smallcaps all-ə-Plantilya:Smallcaps all-ee-əm]] |
| Kategoriyang elemento |
aktinido |
| Group, period, block |
3, 7, f |
| Gibug-aton sa atomo |
(243) |
| Kontorno sa elektron |
[Rn] 5f7 7s2
2, 8, 18, 32, 25, 8, 2
 Electron shells of americium (2, 8, 18, 32, 25, 8, 2) |
| History |
| Pagkadiskobre |
Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso (1944) |
| Physical properties |
| Phase |
magahi |
| Density (near r.t.) |
12 g·cm−3 |
| Melting point |
1449 K, 1176 °C, 2149 °F |
| Boiling point |
2880 K, 2607 °C, 4725 °F |
| Heat of fusion |
14.39 kJ·mol−1 |
| Molar heat capacity |
62.7 J·mol−1·K−1 |
| Vapor pressure |
| P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T (K) |
1239 |
1356 |
|
|
|
|
|
| Atomic properties |
| Oxidation states |
7, 6, 5, 4, 3, 2
(amphoteric oxide) |
| Electronegativity |
1.3 (Pauling scale) |
| Ionization energies |
1st: 578 kJ·mol−1 |
| Atomic radius |
173 pm |
| Covalent radius |
180±6 pm |
| Miscellanea |
| Crystal structure |
hexagonal
|
| Magnetic ordering |
paramagnetic |
| Electrical resistivity |
0.69[1] µΩ·m |
| Thermal conductivity |
10 W·m−1·K−1 |
| CAS registry number |
7440-35-9 |
| Most stable isotopes |
| Main article: Isotopes of americium |
| iso |
NA |
half-life |
DM |
DE (MeV) |
DP |
|---|
| 241Am |
trace |
432.2 y |
SF |
- |
- |
| α |
5.486 |
237Np |
| 242mAm |
trace |
141 y |
IT |
0.049 |
242Am |
| α |
5.637 |
238Np |
| SF |
- |
- |
| 243Am |
trace |
7370 y |
SF |
- |
- |
| α |
5.275 |
239Np |
|
| · r |
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