Input interpretation
americium (chemical element)
Periodic table location
Periodic table location
Image
Image
Basic elemental properties
![atomic symbol | Am atomic number | 95 short electronic configuration | [Rn]7s^25f^7 Aufbau diagram | 5f 7s block | f period | 7 atomic mass | 243 u (unified atomic mass units) (atomic mass number given for longest-lived isotope) half-life | 7390 years](../image_source/caadf31260fa3f4cf0b961d26bb19596.png)
atomic symbol | Am atomic number | 95 short electronic configuration | [Rn]7s^25f^7 Aufbau diagram | 5f 7s block | f period | 7 atomic mass | 243 u (unified atomic mass units) (atomic mass number given for longest-lived isotope) half-life | 7390 years
Thermodynamic properties
phase at STP | solid melting point | 1176 °C (rank: 40th) boiling point | 2011 °C (rank: 54th) (properties at standard conditions)
Material properties
density | 13.67 g/cm^3 (rank: 14th) molar volume | 17.8 cm^3/mol thermal conductivity | 10 W/(m K) (rank: 70th) (properties at standard conditions)
Electromagnetic properties
magnetic type | paramagnetic volume magnetic susceptibility | 7.04×10^-4 mass magnetic susceptibility | 5.15×10^-8 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 1.251×10^-8 m^3/mol (cubic meters per mole) superconducting point | 0.6 K (kelvins) color | (silver)
Reactivity
valence | 4 electronegativity | 1.3 first ionization energy | 578 kJ/mol (kilojoules per mole) ionization energies | 578 kJ/mol
Atomic properties
term symbol | ^8S_(7/2) atomic radius | 175 pm covalent radius | 180 pm (electronic ground state properties)
(neutral americium atomic spectrum)
Abundances
solar abundance | 0 mass% meteorite abundance | 0 mass% crust abundance | 0 mass% ocean abundance | 0 mass% human abundance | 0 mass% solar molar abundance | 0 mol% meteorite molar abundance | 0 mol% ocean molar abundance | 0 mol% crust molar abundance | 0 mol% human molar abundance | 0 mol%
Nuclear properties
half-life | 7390 yr lifetime | 10700 yr (rank: 1st) specific radioactivity | 7.376 GBq/g decay mode | alpha emission nuclear spin | Am-235: 5/2^- | Am-236: 5^- | Am-237: 5/2^- | Am-238: 1^+ | Am-239: 5/2^- | Am-240: 3^- | Am-241: 5/2^- | Am-242: 1^- | Am-243: 5/2^- | Am-244: 6^- | Am-245: 5/2^+ | Am-246: 7^- | Am-247: 5/2^? unstable isotopes | Am-243 (7390 yr) | Am-241 (432.5 yr) | Am-240 (50.8 h) | Am-242 (16.019 h) | Am-239 (11.9 h) | Am-244 (10.1 h) | Am-245 (123 min) | Am-238 (98 min) | Am-237 (73 min) | Am-246 (38 min) | Am-247 (23 min) | Am-248 (10 min) | Am-235 (9.83 min) | Am-236 (220 s) | Am-233 (190 s) | Am-234 (139 s) | Am-232 (78.6 s) | Am-249 (60 s) | Am-231 (30 s) neutron cross-section | 74 b
Identifiers
CAS number | 7440-35-9 PubChem CID number | 23966