Input interpretation
α-berkelium | element types
Result
berkelium
Periodic table location
Periodic table location
Basic elemental properties
![atomic symbol | Bk atomic number | 97 short electronic configuration | [Rn]7s^25f^9 Aufbau diagram | 5f 7s block | f period | 7 atomic mass | 247 u (unified atomic mass units) (atomic mass number given for longest-lived isotope) half-life | 1380 years](../image_source/4af67575f5d1ee5d63d4aa4841a764f7.png)
atomic symbol | Bk atomic number | 97 short electronic configuration | [Rn]7s^25f^9 Aufbau diagram | 5f 7s block | f period | 7 atomic mass | 247 u (unified atomic mass units) (atomic mass number given for longest-lived isotope) half-life | 1380 years
Thermodynamic properties
phase at STP | solid | melting point | β-berkelium | 986 °C (properties at standard conditions)
Material properties
density | β-berkelium | 13.25 g/cm^3 | α-berkelium | 14.78 g/cm^3 molar volume | 16.7 cm^3/mol | thermal conductivity | 10 W/(m K) (rank: 70th) | (properties at standard conditions)
Reactivity
valence | 4 electronegativity | 1.3 first ionization energy | 601 kJ/mol (kilojoules per mole) ionization energies | 601 kJ/mol
Atomic properties
term symbol | ^6H_(15/2) (electronic ground state properties)
(neutral berkelium 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 | 1380 yr lifetime | 1990 yr (rank: 1st) specific radioactivity | 38.82 GBq/g decay mode | alpha emission nuclear spin | Bk-237: 7/2^+ | Bk-239: 7/2^+ | Bk-241: 7/2^+ | Bk-242: 2^- | Bk-243: 3/2^- | Bk-244: 4^- | Bk-245: 3/2^- | Bk-246: 2^- | Bk-247: 3/2^- | Bk-248: 6^+ | Bk-249: 7/2^+ | Bk-250: 2^- | Bk-251: 3/2^- unstable isotopes | Bk-247 (1380 yr) | Bk-248 (9.5 yr) | Bk-249 (330 days) | Bk-245 (119 h) | Bk-246 (44 h) | Bk-243 (4.4 h) | Bk-244 (4.35 h) | Bk-250 (192.67 min) | Bk-251 (55.67 min) | Bk-253 (10 min) | Bk-242 (7 min) | Bk-240 (4.83 min) | Bk-241 (4.67 min) | Bk-239 (200 s) | Bk-238 (144 s) | Bk-252 (110 s) | Bk-254 (60 s) | Bk-237 (60 s) | Bk-236 (60 s) | Bk-235 (20 s) neutron cross-section | 710 b
Identifiers
CAS number | 7440-40-6