Input interpretation
californium (chemical element)
Periodic table location
Periodic table location
Basic elemental properties
![atomic symbol | Cf atomic number | 98 short electronic configuration | [Rn]7s^25f^10 Aufbau diagram | 5f 7s block | f period | 7 atomic mass | 251 u (unified atomic mass units) (atomic mass number given for longest-lived isotope) half-life | 901 years](../image_source/cfd05b9178446ebf2eac256b48f91bc1.png)
atomic symbol | Cf atomic number | 98 short electronic configuration | [Rn]7s^25f^10 Aufbau diagram | 5f 7s block | f period | 7 atomic mass | 251 u (unified atomic mass units) (atomic mass number given for longest-lived isotope) half-life | 901 years
Thermodynamic properties
phase at STP | solid melting point | 900 °C (rank: 53rd) (properties at standard conditions)
Material properties
density | 15.1 g/cm^3 (rank: 12th) molar volume | 16.6 cm^3/mol (properties at standard conditions)
Reactivity
valence | 4 electronegativity | 1.3 first ionization energy | 608 kJ/mol (kilojoules per mole) ionization energies | 608 kJ/mol
Atomic properties
term symbol | ^5I_8 (electronic ground state properties)
(neutral californium 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 | 901 yr lifetime | 1300 yr (rank: 1st) specific radioactivity | 58.52 GBq/g decay mode | alpha emission nuclear spin | Cf-237: 5/2^+ | Cf-238: 0^+ | Cf-239: 5/2^+ | Cf-240: 0^+ | Cf-241: 7/2^- | Cf-242: 0^+ | Cf-243: 1/2^+ | Cf-244: 0^+ | Cf-246: 0^+ | Cf-247: 7/2^+ | Cf-248: 0^+ | Cf-249: 9/2^- | Cf-250: 0^+ | Cf-251: 1/2^+ | Cf-252: 0^+ | Cf-253: 7/2^+ | Cf-254: 0^+ | Cf-255: 7/2^+ | Cf-256: 0^+ unstable isotopes | Cf-251 (898 yr) | Cf-249 (351 yr) | Cf-250 (13.08 yr) | Cf-252 (2.645 yr) | Cf-248 (333.5 days) | Cf-254 (60.5 days) | Cf-253 (17.81 days) | Cf-246 (35.7 h) | Cf-247 (187 min) | Cf-255 (85 min) | Cf-245 (45 min) | Cf-244 (19.4 min) | Cf-256 (12.3 min) | Cf-243 (10.7 min) | Cf-241 (227 s) | Cf-242 (220 s) | Cf-240 (57.6 s) | Cf-239 (39 s) | Cf-237 (2.1 s) | Cf-238 (21.1 ms) neutron cross-section | 2900 b
Identifiers
CAS number | 7440-71-3 PubChem CID number | 23997