 Periodic Table 
| Americium | Symbol | Am | | Atomic Number | 95 | Relative Atomic Mass 12C = 12.0000 | [ 243 ] 243.0614 | | Significant Atomic Mass | 243 Neutrons 148 | | Atomic Radius pm | 173 | First Ionisation Energy kJ mol -1 | 578.2 | | Electronegativity | 1.3 | | Density kg m -3 | 13670 [293 K] | | Molar Volume cm 3 | 17.78 | Thermal Conductivity W m -1 K -1 | 10 [300 K] (est.) | | Melting Point K | 1445 | | Boiling Point K | 2880 | | Number of Isotopes | 23 |  | 241 Am 432.7 year 242 Am 141 year / 16.02 h 243 Am 7.37x103 year 244 Am 26 min/ 10.1 h | | Inner + outer Shells | | | Inner + outer Orbitals | | | Filling Orbital | | | Ground State Electron Configuration | | | | Ground State Electron Configuration with free Orbitals (n= 23 ) |  | | | Ground State Electron Configuration with compressed Orbitals (n=162 ) |  | | | | Singularity | | | | s | p | d | f | g | h | i | j | 1 | 2 | | | | | | | | 2 | 2 | 6 | | | | | | | 3 | 2 | 6 | 10 | | | | | | 4 | 2 | 6 | 10 | 14 | | | | | 5 | 2 | 6 | 10 | 7 | 7 | 18 | | | | 6 | 2 | 6 | 10 | 14 | 18 | 22 | | | 7 | 2 | 6 | 10 | 14 | 18 | 22 | 26 | | 8 | | | | | | | | |
| | | | Term Symbol | 8S 7/2 | | CAS Reg-ID: | 7440-35-9 | | Discovery | Discovered by G.T. Seaborg, R.A. James, L.O. Morgan and A. Ghiorso (Chicago, USA) in 1944 | | Name Derived From | English America |
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